From the announcement:
Want to join one of the largest Warhammer 40k games in all of North America? Then come to Apocalypticon 2013!
Apocalypticon 2013 is MiniWarGaming's and Black Knight Game's fourth annual event. Last year they had nearly 500,000 points, and this year are hoping for even more.
The main event will be held from Friday, July 26th, to Saturday, July 27th in Hamilton, Ontario.