This year will be the first time I go to Interfug. I found it while browsing the CCC event calendar 2 weeks ago. I have no idea what to expect, especially because the program preview currently up only lists a few talks (but it clearly says it is still not the full program).
Still, even if there aren't many talks, I like the spirit of these conferences and very interesting conversations you get to have with very interesting people who go there.
Plus, it's only a 90 min train ride away from Dresden, so if I don't like it, I will just go home.
It's called the "hallway track" when you spend your time talking to people around, instead of going to one of the conference rooms to watch the talks at any conference.