I'm going to see Bayside, Saves the Day, Balance & Composure, Glassjaw, Streetlight Manifesto, and RxBandits. I'll definitely try to catch Mixtapes, Cartel, Daylight, Hostage Calm, Fall Out Boy, and I Call Fives.
Based on that, is there anyone else I should check out?
Definitely try to catch Major League! Based on the bands you listed, I think you would like them and they put on an awesome live show!