Tickets are on sale for Activision's first annual event dedicated to Call of Duty, Call of Duty XP, at www.callofduty.com/xp. The event will take place September 2 - 3 in Los Angeles. Call of Duty XP tickets are now on sale. Tickets are $150 and are valid for both days of the event. In addition, buying a ticket gives you admission to all events and activities with the exception of food and drink. Naturally you'll have to pay for your own travel to and from the event. You can buy up to two tickets, the proceeds of which will go to the Call of Duty Endowment, a non-profit organization that helps returning veterans find employment, establish careers and transition back to civilian life. You must be 18 years old or older to attend.