I went ahead and decided to organize BarCamp Antwerp (in Belgium), even though I have little clue of how to do this.
The date is June 14th (a Saturday). I've helped organize the first Vloggercon (http://vloggercon.org), and I know discussions about dates are endless (and fruitless), so lets stick with this date. The weather should be decent.
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About Antwerp:
Antwerp is an enjoyable city in Belgium, fairly easy to get to from Holland, France or Germany.