Hi,
FOSDEM "is a free event that offers open source communities a place to meet, share ideas and collaborate" (
source) that takes place at the ULB Campus Solbosch, Brussels, Belgium 2 & 3 February 2013.
Vincent Massol from XWiki
proposed a wiki meetup at FOSDEM 2013, however that devroom wasn't accepted.
[Update 2013-01-06]
Contrary to prior considerations there won't be a DokuWiki developer meetup at FOSDEM. I'll be at FOSDEM but in the IRC meeting on 2013-01-06 I was the only one who had already booked something and most other developers said that they are not planning to come so if you are looking for a DokuWiki developer meetup you need to wait for our hackfest this year.
[/Update]
I'll be in Brussels from Thursday evening till the end of the FOSDEM, if you want to meet me feel free to contact me.
Michael