Not seeing him at the Anthem because won't be around but seeing him in Boston. Have seen him before and it was great. Enjoy!
I don't know if you've been to the Anthem, but if you don't plan on trying to get to the front, I found that hanging towards the sides or in the back towards the sides is the best place to go. You get breathing room, you can actually see the singer, and you don't feel suffocated.