If you know what room a given talk was presented in, the FOSDEM 2020 videos are now available for downloading (but don’t seem to be posted in Youtube yet):
Scheduled talks are listed here.
The talk I’d like to watch livestreamed is where an explanation is given of the wild and crazy ARM boards (“FOSDEM Video Box” HDMI capturing devices) they use during the conference to capture both the video output of all presenters laptops, and the video and audio of the camera filming of the presenter. Serious video hackery accomplishes this. These video geeks are a rare breed of special ultra-nerds (Hint: check out the bio of Luc Verhaegen). And I mean that in the nicest way possible.
They inexpensively stream 720p videos of all 800+ presentations! This is a small miracle, IMHO.