I'm going because I couldn't get FOB tickets for anywhere else. I'm going to hate the rest of my time there. I'm glad it got moved to Six Flags because now I can think of it a day at Six Flags with an added FOB concert.
You can always see Into It.Over It., I Call Fives, and Andrew W.K. - most people who are fans of music in general will enjoys these acts. If you like metalcore, go see Of Mice & Men, their most recent set is pretty cool.