WikiSym and WikiMania - Poland Gdansk, Jul 8-13th, 2010
is a conference aimed at academics that in 2006 and 2008 had a great turnout of Foswiki (or TWiki) people.
is the Wikipedia Conference aimed at Wikipedia Contributors. It would be a great place to pick the brains/make friends with those OpenLetterToWikipedia
They are co-located in Poland this year in a couple of weeks time.