Tippman Challenge August 9 and 10 , 2013 @Mirabel paintball (just north of MTL) Home | Paintball Mirabel
Draws on avg 800 players each year. I'm going to be there like each year. You can camp onsite too.
Here's a teaser from last year https://www.youtube.com/watch?v=dx3N8Y90NuI
but theres tons of videos from the event.