Ok, so I was looking on the Molson website and it says that cameras are only allowed if bands "ok" it. I have been to the Molson a few times before for Great Big Sea and I have yet to be allowed to bring my camera in. They will either make you take it back to your car, put it in a locker, or they will take it, and give you a ticket number so you can pick it up after the show... Your best bet would be to hide it, or not bring it in at all.
With or without the cameras, the show is going to rock! 