I went to the L.A. event and it was highly unorganized, but seriously fun. The way it was set up time-wise, there was no opportunity to have her sign anything individually (if I were you, I would bring an album or something just in case).

She spent the first half of her time talking about her album, and cutely singing along while they played it for the audience , and the latter half taking pictures. After we got our pictures taken, they passed out pre-autographed photos and a makeup case with an Utada emblem on it.

The way today's event was set up, those who made reservations were put on a printed-out list, and received wristbands. The people with wristbands got priority entrance and anyone without one got in through luck. In case it's set up the same in New York, I would try and get there as early as possible (I'd wager there were over 2000 people there and some people were waiting for 12 hours!) and talk to the people handling the wristbands (they were in the front). They made a wait-list for wristband pickup for those who didn't make an appointment or reservation, and if you were nice enough, they even just gave you and your party the wristbands on the spot. Then, you just gotta wait in line with other wristband-brandishing folks.

It was amazing. Good luck to everyone going tomorrow.