I see that people are talking about GO!GO!7188 coming back to New York, but I wasn't sure if anyone mentioned yet that they are also hitting up Chicago and Bethlehem, PA. The Bethlehem concert is a big musicfest too, so it is free.
I'm going to the New York one myself and I really recommend it for anyone who didn't see them last time they were there. The Knitting Factory is really small and you can really get close to the band. I was in the very front last time and it was amazing. Plus GO!GO!7188 hung out in the lobby afterward and I managed to talk to them a bit and get autographs (and Akko's bass pick!). It's only 10 bucks for tickets now, so it's super reasonable too!
*trying to pimp her favorite band*