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.
A select number of ticket purchasers will also be eligible to be the first gamers to check out the multiplayer portion of Call of Duty Modern Warfare 3. Details on that as well as all the tournaments and prizes related to the event can be found at the aforementioned link.
More details on the event can be found in this handy dandy FAQ. On a related note the official Facebook page for the Entertainment Consumer Association (ECA) at Facebook.com/theECA is offering 200 guaranteed open slots in the Call of Duty Elite beta. You can visit the page and "like it" for a chance to win.