Duke222, yes you need tickets, and they are long since sold out. However, I'll bet you can sneak in (I won't tell), or just hang out close by with a few beers and enjoy the music. I don't know what venues he's playing, but AC is a small place, with small places to have a concert (I.E. which bar is it?). So I don't think you'll have a hard time finding out.
Lynden