I haven't been to FOSDEM since pre-COVID but the last once or twice I went I pretty much came to the conclusion that the only sensible strategy (especially given the availability of recordings) was to pick a devroom with talks/people you were mostly interested in and hang there.

Trying to hop from session to session was just a recipe for frustration. At the end of the day, there are probably twice the number of people than the various facilities can really support.

Today the JS devroom if way too full and the sound in the container devroom makes it very hard to understand the speakers :/ Everyone is very nice and helpful though