Hey,
Thought you all might be interested since this is happening near the Hackerspace.
From 13.00 to 14.00 big parade with departure Plac Bankowe, and after,
until 19.00 many activities in the old town: dance, makeup, percussions, concerts, board games with Ludoteka Roszada,...
http://kontynent-warszawa.pl/streetparty/2011/
Lets see if we can have a hacker representation there!
Cya