Can you buy tickets at the gate?

Like the other person said, it depends if they sell out of seats before the concert and after that, it's a matter of if they sell out before the concert begins. Since those bands aren't that well known, I'm betting that you will be able to get tickets at the gate if you get there early. Also, most of the time tickets cost a little more if you buy them at the gate instead of buying them online. So in that case, you may want to bring some extra money--probably 20 instead of 10--just in case.