You could just take a point and shoot film or digital in with you. I did this at a U2 concert a little over a year ago and got some great pictures (at least great for memories!) all from a crappy minolta 4 megapixel digital. I put them on line for the people that were standing next to me. You can see them here-
http://www.patrickjames.net/u2
Not bad for a crappy little camera. If you get a cheap one you don't have to worry about losing it or getting it confiscated. The tickets probably cost you more. Think about it.
Good luck and have fun!
Patrick