Normally for boarding, arrivals are around 6-8pm on the Sunday evening (but they have to eat before or bring a picnic as the canteen is closed on Sunday night), or they can join on Monday morning at 10am, but they have to go almost immediately to the classes. Lessons are 9.30-5.30pm Monday-Saturday (11am on first Monday). In non COVID times there was also a small show on the final Saturday (and both Saturdays for the levels having 1 week options). This was at 11.30 for up to intermediate level, and 2-4pm for the older classes. On Sunday they normally arrange an optional outing such as visiting the Paris Opera building and Eiffel Tower (some do go with their families on Sunday, and some of the older ones arrange their own thing). In the evenings they also did arrange a few things. You do need to bring bedsheets, pillows and covers and it is not possible to rent them from the school. You can buy at the large shopping mall in La Defense if necessary, but it is normally fairly warm in July, so duvets not needed.
Uniform in prior years was girls was a pink leotard for junior, elementary and intermediate levels, and black for Average, Advanced and superior). Character shoes are also needed for intermediate, average and advanced levels. It's normally 3 sharing a room, and each room has a bathroom. The meals in the canteen have a few options. Those not boarding still take lunch at the canteen. My daughters really liked the boarding and made good friends. If you can get boarding its worth taking, the only exception is if your child has a special diet (certain allergies). I recall In 2019 the info packs were sent already in March and last year it was in early June.