Just Gonna Giveaway Portal 2 (Steam) Cause It's Not Doing Anything Else Sitting There.

OK first person to correctly answer this question gets the game, and the question is fairly easy... and its Portal 2, only few people have a Steam account but haven't played this.

In North America, Portal 2 was released in retail on the same day as __________ and __________ (Hint: One was a PS3 Exclusive). Name the two games, and name the big gaming event that started the day after.