not to be a wet blanket, but honestly i wouldn't bother bringing in a DLSR with telezoom lens (or any camera for that matter), for the following reasons:-
- no photography allowed, like what showtime said.
- it's Linkin Park. which means plenty of crazy fans who'll be jumping around and dancing and screaming. you wouldn't wanna risk your camera, esp since you're in the audience.
- unless you get a photog pass with stagefront access, it's near impossible to shoot over the heads of the fans. unless you're in the front row, which means you'll be squashed by a thousand sweaty screaming fans. concert lights is also very erratic which means plenty of wasted shots.