A BarCamp is taking place in Issy-Les-Moulineaux, near Paris, this WE. The topics include Web 2.0 (of course), as well as social networks and other things. As always, attendance is free, though participants are expected to contribute by coding, throwing ideas in the air, debating, etc. You could say it is rather geeky ;-). I notice Eric MahÃ© from Sun France among the attendees.
More details on BarCamps.
Register by editing the official wikipage.