FOSDEM (Brussels, Belgium) is probably the best community driven FLOSS event in Europe. It's massive, chaotic and fun. Also, Belgium is renowned for beer. It's all true: Jyhem has been there twice already.
It will happen 1-2 February 2014: https://fosdem.org/2014/
Brussels, belgium
Jean-Marc Libs has volunteered for helping organize the wikis-devroom.
The call for holding a Tiki stand seems to have triggered no reaction.
TikiFestFosdem2014