I was reading a fan fic story where it touches on Mac at the site of the WTC at the end of Blink. It was suggested in that story that 9/11 was Claire's B-day and a reviewer suggested they thought it was her birthday too since she got the opera tickets. What do you guys think? Can you see it being Claire's B-Day? I'm really not sure but it would make sense that he gets the tickets for her as a birthday gift.