I happened to be in Brussels for this year's installement of FOSDEM and it sure is an amazing free event, pulled off by a lot of voluntary work.

The plan was to have a short writeup and comment on the talks I listened to, but I rather spent the time watching some more talks in their recorded form. So I recommend you pick by your interests and do the same: Saturday, Sunday

At least I got around to showing a few tidbits to fellow astronomers. Slides