It was just announced that Justice will be performing at the 5th annual Outside Lands festival during the weekend of August 10th - 12th, 2012 in Golden Gate Park, San Francisco, CA.
For more information you can vist:
Main Festival Website: Outside Lands
On Sale & Ticketing Info:
Advance 3-Day & VIP Passes - On Sale - Thursday, April 19th at 12:00pm PDT
Ticketing Page: http://sfoutsidelands.com/tickets/