I think a chat room idea is great - especially for the 20th anniversary but I would be up for it on Burbs day as well. Considering there is a 6 to 7 hour difference between Europe and the US (do we have anyone from Australia on the Board) we would have to set a time from somewhere between possibly 9AM US central standard (for you late risers) to about 2 PM. That would be, what, 3 PM to 8 PM for western Europe, if I understand the time differences correctly.
Feb 17th 2009 is a Tuesday, which complicates things quite a bit since many of us will be at work or in school.
As far as the other Burbs day activities, a synchronized watching of the Burbs would be good and I liked Bonnie's idea of taking a shot of whatever drink you want whenever Art mentions food - or, you could eat whatever food Art mentions at the time he mentions it, but you would be pretty stuffed by the end of the movie.