According to the POB website, students will be part of the Defile at the season-opening Gala on 9/24, and it's listed as the last on the program, after the Pite and the Forsythe. It starts at 7:30pm.
Will they do the Defile first, or will they drop the children, because Defile starts after 8pm?
https://www.operadeparis.fr/en/season-16-17/ballet/gala