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FALL SCHEDULE 2026 UPPER SCHOOL

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

MONDAY ACTIVITY

INFO

GRADE

FEE (€)

TIME

CHINESE AS A FOREIGN LANGUAGE

Differentiated levels within the class for beginners and intermediates. This course is not designed for fluent Chinese speakers, but they may join! (This counts as Creativity or Skill for CAS / IA)

7-12

160

17:00-18:00

CLIMBING

Interested in learning to climb, or to continue developing your climbing skills? Basic and advanced climbing in ISB climbing wall (indoors). Climbing shoes and all equipment is provided by ISB. (This counts as an Activity or Physical Recreation for CAS / IA)

7-12

160

17:00-18:00

HOME LANGUAGE : HEBREW - JAPANESE SPANISH - GERMAN NORWEGIAN PORTUGUESE

ISB knows that a strong home language is a foundation for learning other languages, and a strong home language is also important for a student as they build their identity. Students in Home Language continue developing essential academic language skills in their home language, including listening, speaking, reading, and writing. The goals of the course are: To support the students to develop their academic language To support the students to develop the reading skills which will allow them to read for enjoyment Students are expected to make a full year (three season) commitment. Home Language Japanese for grade 10 is from 17:00 to 18:00

7-10

FREE

16:00-17:00

HOME LANGUAGE : JAPANESE

ISB knows that a strong home language is a foundation for learning other languages, and a strong home language is also important for a student as they build their identity. Students in Japanese Home Language continue developing essential academic language skills in their home language, including listening, speaking, reading, and writing. The goals of the course are: To support the students to develop their academic language To support the students to develop the reading skills which will allow them to read for enjoyment Students are expected to make a full year (three season) commitment.

FREE

17:00-18:00

MUSICAL THEATRE WORKSHOP (4-WEEK SHORT COURSE)

Led by a professional Music Theatre Coach, you will learn how to integrate acting techniques into a song-and-dance number. It covers all 3 core disciplines of musical theatre: singing, dancing, and acting! It's open to everyone, from complete beginners to seasoned performers. (This counts as Creativity or Skill for CAS / IA) Dates : 2 Nov, 9 Nov, 16 Nov, 23 Nov

7-12

16:00-17:00

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

MONDAY ACTIVITY

INFO

GRADE

FEE (€)

RAIDERS PERFORMANCE CLIMBING TEAM

For students who wish to reach their full potential in any climbing gym, this programme offers the opportunity to deepen both knowledge and strength. You will learn advanced knots, techniques, and materials, as well as explore the main climbing disciplines practiced in gyms. including lead climbing, bouldering and top rope. Throughout the season, we will also organise competitive events on and off campus to challenge your skills and showcase the progress you’ve achieved. Practice: Monday AM and Friday PM (climbing wall) Try out date: Monday, 14 September 2026 Head Coach: Coach Gabriel drachenbergg@isb.be (This counts as an Activity or Physical Recreation for CAS / IA)

7-12

for both practices

7:00-8:15

TENNIS BEGINNER

For beginner players who have never played, just played a little or even played more but still want to work on coordination, hitting controlled strokes, and/or movement. They have no or limited tennis experience and are still working primarily on getting the ball into play. (This counts as an Activity or Physical Recreation for CAS / IA) See registration information p.8

7-9

160

18:00-19:00

240

TIME

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

TUESDAY ACTIVITY

INFO

GRADE

FEE (€)

TIME

CLIMBING

7-12

160

17:00-18:00

CREATIVE PHOTOGRAPHY

Calling photographers of all skill levels. You will learn how to transform ordinary settings into amazing photos that leave an impression through the use of creative camera settings, lighting, and expert editing. Each week you can try out different techniques along with printing, collage, and even designing your own photo zines (mini-book). Bring your iPad or family camera, or try out our professional cameras, lights and lenses as you expand your creativity through photography. More info here. (This counts as Creativity or Skill for CAS / IA)

6-12

160

16:00-17:00

DUNGEONS & DRAGONS

There really isn’t any other way to put this... it’s Dungeons and Dragons! You and your friends will be on an adventure to battle monsters, solve puzzles and guide your heroes through quests for treasure. Join this new and exciting fantasy card and roleplaying game. (This counts as Creativity or Skill for CAS / IA)

7-12

240

16:00-18:00

KICKBOXING

This is a place where you can learn fun and safe techniques with a combination of traditional Bokator, Taekwondo, Karatedo, Filipino Martial Arts, and American Boxing. It is well known to improve coordination, strength, and confidence while learning the lifelong-values of martial arts. No experience is needed— everyone is welcome to get active, learn new skills, and have fun. (This counts as an Activity or Physical Recreation for CAS / IA)

7-12

160

17:00-18:00

PILATES

Build strength and level up your performance. Pilates combines core strength, mobility, balance and control to help you feel stronger and move with confidence. Perfect for off-season Raider athletes who want to stay game-ready or anyone looking to get stronger and more flexible. (This counts as an Activity or Physical Recreation for CAS / IA)

8-12

160

16:00-17:00

SEWING PROJECTS FOR FUN

Get creative and learn to sew. Explore the basics of hand and machine sewing while creating 3 - 4 projects you’ll actually want to take home. Learn new skills, experiment with fabrics and turn your ideas into something real. No experience needed, and all materials are provided, so just bring your creativity. (This counts as Creativity or Skill for CAS / IA)

9-12

160

16:00-17:00

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

WEDNESDAY ACTIVITY

INFO

GRADE

FEE (€)

TIME

UNIFIED SOCCER

For ILS (Intensive Learning Support) students only. Inclusive sports programme that combines both Special Olympic Athletes and partners on teams for training and competitions. At practice, students from grades 3-12 enrolled in ILS as well as peer players from grades 5-12, will develop fundamental skills, and athletic abilities in a positive environment for making friends and establishing a community. All abilities are welcome. Come join Coach Miller this year in ISB's Unified Soccer team.

3-12

FREE

16:00-17:00

UNIFIED SOCCER - PEER COACHES / PLAYERS

Do you consider yourself a leader? Someone who unites others and enjoys making dreams come true? If so, you may be a perfect match for our Special Olympics Unified Soccer Team. This fall, we are looking for Unified Partners to coach our Special Olympians by providing both athletic and social support during practices. Join us as we engage in a number of fun soccer based games and activities that are designed to help showcase the talents of Special Olympians. (This counts as Service for CAS / IA) For more information please email Coach Miller: millerr@isb.be

5-12

FREE

16:00-17:00

TENNIS INTERMEDIATE

Intermediate players get the ball into play. They can sustain a short rally at slow or medium pace. They are fairly consistent when hitting slow and medium paced shots. They have some directional control on moderate shots. They are not comfortable with all strokes and need to work on depth and variety. They have improved court coverage. (This counts as an Activity or Physical Recreation for CAS / IA) See registration information p.8

7-9

145

18:00-19:00

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

THURSDAY ACTIVITY

INFO

GRADE

FEE (€)

TIME

COMIC BOOK ILLUSTRATION

Learn how to develop your own characters, illustration style, and stories to create comics. Each lesson will explore a different genre of graphic storytelling - superheroes, webcomics, manga, and more! (This counts as Creativity or Skill for CAS / IA)

7-12

145

17:00-18:00

STRONG-HER : SELFDEFENCE FOR GIRLS

Build confidence, awareness, and practical self-defence skills in a fun, supportive environment. Learn how to use your voice, set boundaries, respond under pressure and practise simple, effective techniques to help you feel stronger and more confident. No experience needed, just come ready to move, learn and have fun! (This counts as an Activity or Physical Recreation for CAS / IA)

7-12

145

16:00-17:00

TENNIS BEGINNER

10-12

145

18:00-19:00

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

FRIDAY ACTIVITY

INFO

GRADE

FEE (€)

TIME

RAIDERS PERFORMANCE CLIMBING TEAM

For students who wish to reach their full potential in any climbing gym, this programme offers the opportunity to deepen both knowledge and strength. You will learn advanced knots, techniques, and materials, as well as explore the main climbing disciplines practiced in gyms. including lead climbing, bouldering and top rope. Throughout the season, we will also organise competitive events on and off campus to challenge your skills and showcase the progress you’ve achieved. Practice: Monday AM and Friday PM (climbing wall) Try out date: Monday, 14 March Head Coach: Coach Gabriel drachenbergg@isb.be (This counts as an Activity or Physical Recreation for CAS / IA)

7-12

240 for both practices

16:00-17:30

TENNIS INTERMEDIATE

7-9

145

16:00-17:00

TENNIS INTERMEDIATE

10-12

145

17:00-18:00

TENNIS INTERMEDIATE

10-12

145

18:00-19:00

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

FALL REGISTRATION* Wednesday, 9 September 2026 (12:00) – Registrations open via SchoolsBuddy Sunday, 13 September 2026 (23:59) – Online registration ends Between 15 and 17 September 2026 - Confirmations of activities Monday, 21 September 2026 – First day of ISB Plus Fall Season Friday, 27 November 2026 – Last day of ISB Plus Fall Season

REGISTRATION FOR ISB PLUS ACTIVITIES Before every season you will be informed on when registrations open. Please check your Heads’ Letters and the ISB Community Updates. Registrations are through SchoolsBuddy: isb.schoolsbuddy.net Use your ISB account (your single sign-on (SSO) the same you are using for PowerSchool and the Community Portal). Just go to the SchoolsBuddy website, click the Azure AD button and it will sign you in. Watch this video to help you register for ISB Plus Activities using SchoolsBuddy or follow the steps outlined in this document.

TENNIS REGISTRATION Instructional tennis lessons with Coach Deconinck. Registration is by telephone only (no online registration). Call 02/675 59 66 on the following days/times: From 09:30 - noon Monday, 7 September 2026 Tuesday, 8 September 2026 Wednesday, 9 September 2026 Thursday, 10 September 2026 Friday, 11 September 2026 No calls on the weekend please. Any questions, email: isbplus@isb.be

* If your student is in an ILS classroom, please discuss appropriate activities with their ILS teacher and ISB Plus will do the registration on your behalf - do not use Schoolsbuddy registration directly.

FALL SCHEDULE

UPPER SCHOOL 21 SEPTEMBER 27 NOVEMBER 2026

LATE BUSES SERVICE The late bus service is available from Monday to Thursday for students in grades 5-12. Buses leave from the Chateau parking. Parents who wish to use this service for their children need to complete the following form : LATE BUS ACCESS FORM ISB Late Buses are now being integrated into the BatOnRoute Safe App. It will allow parents to track their child(ren)'s bus and ensure timely meetings at the bus stop. For one-off use of late buses, please contact buses@isb.be or book an occasional trip via the BatOnRoute Safe App. For students in ILS classes, the registration form will only take effect once you have received approval from ISB PLUS. Please fill in ONE form per child. If you are a first-time user of the BatOnRoute Safe App download it through these links: (Android) (iOS) and watch these tutorials (Android) (iOS) Late buses are a free-of-charge, unsupervised service. More information about bus services here.

FALL SCHEDULE NON-ISB PLUS ACTIVITIES ACTIVITY

INFORMATION

GRADE

BSA

The Brussels Sports Association (BSA) provides youth team sports, in English, to the Brussels international community, ages 4 - 13. Our program offerings include soccer, baseball, basketball and volleyball. All of our current programs are mixed (boys and girls). The BSA operates in 3 seasons throughout the school year (fall/winter/spring). Trainings and most games are held on the ISB campus. As a volunteer-based, nonprofit organization, we focus on creating a positive and inclusive environment where children can develop sport-specific skills, learn the value of teamwork and have fun! We invite parents to take part in their child’s experience by volunteering to help coach alongside other volunteer parent coaches. More information can be found here. Contact : office@bsasports.org

PK-7

BUDDIES

Mentors in the Buddies programme guide younger learners in community building, emphasising fair, safe, and respectful play alongside a spirit of kindness. Cost: Free Contact: Emma Liliedahl-Allen liliedahlallene@isb.be

7-9

CLUB INFINITY (MATHS)

Club Infinity is an opportunity for students to explore mathematical puzzles, problem solving and games with their peers. In addition to recreational mathematics, students will participate in different competitions including the Belgian Math Olympiad (OMB), Mathcounts, AMC, and ISMTF. Every Wednesday in MS 212/215 and MS Math Collaboration Space from 15:45-17:00 + optional Tuesdays or Thursdays after school (for competitions). Our first meeting is on 9 September; however, students are welcome to join us at any time. Cost: Free Contact: simoesm@isb.be and yanaks@isb.be

7-10

FITNESS ROOM

Open to all grades 7-12 students after school Monday - Friday 16:00 - 17:30 (Thursday = MS students only). ISB Fitness Coaches are available to help with technique or to create a personalised plan to meet your goals. For more information, contact: toppingc@isb.be

7-12

HIGH SCHOOL YEARBOOK

Passionate about preserving unforgettable moments? Join our Yearbook Team! Capture joyous events, showcase our school's spirit, and leave a lasting legacy. Develop photography, design, and writing skills while collaborating with like-minded students. As a member of the Yearbook Team, you'll have the incredible opportunity to shape and document the memories that will be cherished for years to come. This year, we are also opening up the possibility of multiple leadership positions within the club. These positions come with the added bonus of also acting as your super project. Don't miss out on this chance to leave your mark on our school's history. Cost: Free Contact: hartel@isb.be

10-12

For information on Raiders Athletics please see the following links: Raiders Year Overview Raiders Fall Tryout and Practice Schedule Athletics Coordinator: Suzanna Walton - Contact: waltons@isb.be

FALL SCHEDULE NON-ISB PLUS ACTIVITIES ACTIVITY

INFORMATION

GRADE

INTERNATIONAL AWARD BRONZE

Year-long outdoor education and personal development programme. (IA website https://intaward.org) International Award Bronze Information Session (parents and students) Tuesday 8 September 18:00 - 19:00 (Online session link HERE) Key Dates: Meetings are 1 x month during PL or lunchtime. Workshop: Sat Oct 3 (16.30) until Sun Oct 4 (11:00) Half-day Hike: Sun 31 Jan (08:30 - 13:30) Practice hike: Sun 23 May (08.30 ) - Mon 24 May (15.00) Assessed hike (Ardennes): Sat 19 June - Mon 21 June (16:00 - 15:30) Cost: +/- 230 euros (bus costs TBC) Contact: marshe@isb.be

INTERNATIONAL AWARD SILVER

Year long outdoor education and personal development programme. (IA website https://intaward.org) International Award Silver Information Session (parents and students) Tuesday 8 September 18:00 - 19:00 (Online session link HERE ) Key Dates: Meetings = 1 x month 16:00-17:15 (Mondays) + One week-end morning in the fall Workshop (Ardennes) : Sun 27 Sept (9.00 AM) - Mon 28 Sept (17.30 PM) Practice hike in France (Mont-Ventoux area) : Sun 16 May (6.30 AM) - Wed 19 May (18.00) Assessed hike (Ardennes) : Sat 19 June (6.30 AM) - Mon 21 June (17.30) Cost: Trips include long travel by train and bus +/- 700 euros Contact: Christian Noyon - noyonc@isb.be

INTERNATIONAL AWARD GOLD

Year long outdoor education and personal development programme. (IA website https://intaward.org) International Award Gold Information Session (parents and students) First Meeting will be announced to G11 and 12 in the HS Bulletin and will be held at the end of September 2026 at the HS during a lunch time. Key Dates: Meetings = 2 x month at lunch time + One week-end morning in the fall Practice Expedition in the Vosges: Wed 5 May (8.30 AM) - Sat 8 May (7.30 PM) Assessed Expedition in the Cévennes: Tuesday 22 June (6:30 AM) - Sun 27 June (6:00PM) Cost: Trips include long travel by train and bus +/- 700 euros Contact: Christian Noyon - noyonc@isb.be

11-12

MODEL UNITED NATIONS

Model United Nations (MUN) is an academic simulation of the United Nations where students play the role of delegates from different countries and attempt to solve real world issues with the policies and perspectives of their assigned country. Preparing and participating in MUN helps students develop leadership skills, research, writing, public speaking, and problem-solving skills. Students can join the club to participate in simulations at school and can also choose to participate in international conferences throughout the year (optional). Every Tuesday from 16:00-17:00 Cost: Free (If traveling to MUN conferences, students pay travel and, if necessary, accommodation costs) Contact: salema@isb.be and heglundl@isb.be - for GR9, please contact: mins@isb.be

9-12

FALL SCHEDULE NON-ISB PLUS ACTIVITIES ACTIVITY

INFORMATION

GRADE

NESDA (NEW EUROPEAN SPEECH AND DEBATE ASSOCIATION)

Club NESDA is a great way to work on your confidence with public speaking in front of an audience! A competitive club with two (optional) international tournaments a year, we cover 6 different public speaking events - Debate, Oral Interpretation of Literature, Original Oratory, Impromptu Speaking, Impromptu Duet Acting and Duet Acting. And very exciting for 2026 - this fall we are hosting a tournament here at ISB! Come and join the fun! When: Thursday from 15:45–17:00. Tuesday lunches from 12:10 - 12:40. Where: HS room 114 Note: MS students can be given release time during Tuesday during their PL times from 12:10 - 12:40. Contact: Erin Pedder: peddere@isb.be and Andry Sitara De Jong: dejonga@isb.be or just show up for Thursday's practice.

9-12

RAIDERS ACADEMY

Raiders Academy is an extension programme designed to provide additional holistic athletic education for sports performance and development. All student-athletes in grades 9-12, including non-Raiders sports participants, are welcome to apply. For more information contact Coach Burrows at burrowsb@isb.be .

9-12

SCIENCE CLUB

The Science Club provides an opportunity to explore scientific concepts beyond the standard curriculum. Members engage in advanced, hands-on laboratory experiments, investigate practical applications of biology, chemistry, and physics, and to visit CERN's particle accelerator in Geneva (selection may apply). Additionally, qualified members have the opportunity to represent the school in the International STEM Olympiad. When: Thursdays 3:50- 4:50pm Where: MS room 106 Cost: FREE (If selected to travel to CERN, additional costs will apply for travel and accommodation) Contacts: frankardj@isb.be and bottes@isb.be

8-9

SCOUTING AMERICA

Scouting America is a fun program for boys and girls aged 11-18 to grow in adventure, leadership, and service. Troop 457 meets Tuesdays from 7-8:30 p.m. at Brussels Unit School in Zaventem, camps monthly, and welcomes youth from across the BrusselsCapital Region. Learn more about the organization via Facebook or by emailing the troop at bsascouttroop457@gmail.com

6-12

STUDENT LEADERSHIP TEAM

Students representing every grade collaborate to invent and execute special events, clubs, service projects, and anything else requiring student choice, voice and vision to enrich student life on campus. Cost: Free Contact: vandevussej@isb.be - gilbertm@isb.be

7-9

VEX ROBOTICS CLUB

After a highly successful year, the VEX Robotics Club is back! We are looking for motivated students to join our 2027 Competition Team. To build on last year's achievements, we need a wide range of talents beyond just building and programming. See the action! When: Tuesday & Thursday 4:00 - 5:00 pm Where: Middle School Robotics Lab Contact: Matthew Pierce piercem@isb.be and Jacob De Backer debackerj@isb.be

7-11

FALL SCHEDULE VISUAL AND PERFORMING ARTS ACTIVITIES ACTIVITY

INFORMATION

GRADE

ART CLUB

Unleash your creativity in our High School After School Art Club, every Monday from 4:00 PM to 5:30 PM. Guided by an Art teacher, or working independently you can explore various mediums and connect with fellow artists in a vibrant and supportive space. Perfect for all skill levels. Cost: Free - Contact: hartel@isb.be

10-12

ART TEAM

Learn about art in a real-world context, as well as for making art visible to all through the Student Curatorial Programme. Three to four Art trips are organised per school year. Every second Tuesday during lunchtime in MS Art room. First meeting September 9 during lunch. Cost: Free (cost for trips TBC) - Contact : delannoyclervauxc@isb.be

7-9

CHAMBER MUSIC CLUB

Ready to take your musicianship to the next level? Chamber Music Club is an opportunity to listen deeply, create and discover music in a whole new way where every voice matters. This club is for students with several years of experience on a string instrument or piano. In small, flexible ensembles, you’ll develop your musical and technical skills while exploring a wide range of repertoire and styles. Groups are flexible and meet once a week depending on student availability each season. Days: Mondays & Fridays, 16:00 - 17:00, Metairie Strings Room (MT001) Contact: Violeta Fernandez Torres fernandezv@isb.be

9-12

CHORALE

Chorale is a co-curricular extension of the High School Choir program for students who have mastered the fundamentals of ensemble singing and are ready for a greater musical challenge. Students rehearse and perform advanced choral repertoire while developing independence, artistry, and ensemble awareness. Students auditioning should already demonstrate: Independent part singing: maintaining their vocal line within a multi-part ensemble. Strong vocal technique: healthy tone, breath support, accurate intonation, and blend. Musical literacy: confident reading of rhythms, pitches, dynamics, articulations, and other musical notation. Chorale is designed to challenge accomplished singers as they deepen their musicianship and perform demanding choral literature at a high level. Days: Wednesdays, 15:45 - 17:00, Annex Choir Studio Contact: Cat Leclerc leclercc@isb.be

10-12

JAZZ LAB

For students with at least one year of experience on their instrument, Jazz Lab is an exciting ensemble that explores a variety of musical styles, including jazz, blues, funk, and contemporary music. Students build confidence, develop ensemble and improvisation skills, and learn to perform collaboratively with other musicians. Jazz Lab performs at various venues throughout the year, both on and off campus, giving students valuable performance experience in a fun and dynamic setting. Days: Thursdays, 15:45 - 16:45, Metairie Band Room (MT011) Contact: Tony Passaro passarot@isb.be

6-9

JAZZ ORCHESTRA

For students with ideally three or more years of experience playing jazz on their instrument, Jazz Orchestra is an advanced ensemble that challenges musicians to refine their technique, musicianship, and improvisation skills. Students explore a diverse jazz repertoire while developing strong ensemble performance and musical leadership. Jazz Orchestra performs at a variety of venues throughout the year, both on and off campus, providing rewarding opportunities to showcase their talents in dynamic performance settings. Days: Tuesdays, 16:00 - 17:00, Metairie Band Room (MT011) Contact: Tony Passaro passarot@isb.be

9-12

FALL SCHEDULE VISUAL AND PERFORMING ARTS ACTIVITIES ACTIVITY

INFORMATION

GRADE

PRIVATE MUSIC LESSONS

ISB’s Private Music Lessons programme offers instrumental lessons to ISB students on a flexible schedule. The lessons are for students of all grades for the following instruments: Double Bass, Electric Bass, Cello, Suzuki Cello, Clarinet, Euphonium, Percussion/drums, Guitar, Piano, Saxophone, Trombone, Trumpet, Viola, Violin, Voice, Saxophone, & Suzuki Violin. Please complete this Google Form to register your interest. Days and times depending on student and teacher availability, subject to times outlined on the Private Music Policy 26/27 Contact: Jessica Raynor raynorj@isb.be Cost: Recommended rate is 37 euros for 30 minutes, as per the Private Music Lessons Policy.

THEATRE PRODUCTION ACTING & TECH ‘She Kills Monsters’

A full-scale production on ISB’s Mainstage. Open to all High School students interested in building their acting skills and technical theatre skills. This year’s production will be Qui Nguyen’s ‘She Kills Monsters’. Auditions: 7 & 8 September 2026 Rehearsal days: Mondays and Wednesdays, 16:00 - 18:00 Performances: 19 & 20 November 2026, 19:00, ISB Theatre Contact: Jane Paul paulj@isb.be

10-12

MS THEATRE STUDIO PRODUCTION

Buckle up for an unforgettable night of interactive theater! This year’s Middle School Studio Production is putting the audience in total control. You pick the order of 15 original plays as our cast races against a 30-minute timer. Beat the clock, and the audience claims the mystery prize! Rehearsal days: Mondays & Wednesdays, 16:00 - 18:00, Black Box Theatre Performance: 20 October, Drama Studio Contact: Wyatt Biessel biesselw@isb.be

7-9

PK-12

Please follow the link for more information about the Performing Arts extracurricular activities Head of Performing Arts: Alan Hayes. Contact: hayesa@isb.be