Here is the official schedule for 2021 which might be incomplete. You can look at the previous year schedule here
The academic year 2022-2023 will start the 5th of September. The week 05/09/22 to 10/09/22 is full of courses and courses might not be attended from remote. Holidays for the year are: 31/10/22 to 06/11/22, 18/12/22 to 02/01/23, 27/02/23 to 05/03/23 and 01/05/23 to 08/05/23.