Only the participants of the meeting 'Relevés photométriques grand champ II' can see all the recordings.
You can go check the archived videos here if you are looking for some specific content in your research field.
However, you can see the public videos of this meeting:
Here is the recording for the session that started on June 9, 2021, 3:54 p.m. and finished at 4:11 p.m.
Title: The advance of LSB astronomy (A. Ellien)