The second annual Geekfest is this weekend at Au Coeur des Sciences de l’UQAM.
I won't be able to make it there myself because I'm working this weekend (particularly during all the good stuff like the video game orchestra show), but you should go and pay the few bucks to get in, because you'll see things like this:

Ancient Macintosh computers!
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It hasn't gotten a lot of attention in the anglophone community (I guess that's my fault?), but geeks from around town are converging this weekend for LAN parties, code fests, role-playing games and all sorts of other stuff at the Montreal Geek Festival.
Tickets are $12 for the weekend or $8 a day. The fun is at 752 Sherbrooke W.
And if you're into board games and other non-computerized geekiness, there's also the monthly Geek Outs at Burritoville on Bishop St. The next one is March 20 at 2pm. Attendance is free.