How to inform those concerned of a change in their schedule?

Once you've canceled a class meeting, you can send a letter, e-mail, notification or SMS (if you've subscribed to this service) to notify the people concerned.

If you use a Client EDT connected to a PRONOTE database, the canceled course instantly appears as such on the timetables of teachers, students and staff where applicable; you can also notify the people concerned using the means of communication mentioned above (letters, e-mails, etc.), in addition to information and discussions.