Activision has announced a new event this weekend to promote the online game Call of Duty: Black Ops. From 18:00 tomorrow, May 6, until 18:00 on May 9, all games played online will be entitled to double XP, but not only in the same period, the game will be available online for free also from the Silver users (but only for this game), so that they can try their hand Treyarch multiplayer title.