"The Toronto Game Jam is a FREE, annual, open-to-the-public event where the craziest game makers in the world gather for a 3 day game making binge. Weiss, Webster, Kupferman, Creighton, and Woo explain things best. "TOJam: Party Like It's 19TOJam9" took place from April 25 - 27, 2014 at George Brown College. ~450 game makers attended. TOJam's 10th Anniversary will be held from May 1 - 3, 2015. More details will be announced soon... be afraid."
I'll update this post when more details become available, when it is open, you can register here.
Edit: Registration is now open! You can register by clicking here, it's important to note it is NOT first come first serve. Registration is open until Friday 17th at 11:59pm.