Yeah, this is going to be locked real fast. At the rate the OP's tongue is slipping, he might also get a suspension. Just goes to show, kids, don't sass other folks, lest they sass back.
As for the topic at hand, concerts are very big. Very big, and very loud. Depending on the area, you'll be standing or sitting with potential hundreds of other people that may or may not be uttering deafening cheers from the depths of their lungs. If the latter, you're in luck. If the former, be prepared to stand in a very cramped area for extended periods of time. Also, beware of mosh pits.
I hope that Dragonforce has improved their live performances or that you like out-of-sync music, however.