The artwork, done by Christopher Norman, looks like something churned out using a Spirograph. The original Spirograph was produced by Kenner in the '60s and was easily one of our favorite toys growing up. It was also one of the most versatile art creation devices we'd ever used, and to this day, we still look back fondly on our perfect circles and crazy designs.
The whole thing doesn't look like it was created with a Spirograph, though, just the circle patterns -- the interior looks more like the pages of a book unfurling, while the bottom takes on a messy line stroke to balance the tops precision. While the art doesn't really add much to the band's identity and you can't really tell by a glance what you'd be in for -- the fact the show is free means it's less about selling the show and more about selling the idea that you want to go to a show. In that case, it certainly works. Plus, who doesn't want to rock out with a burrito in their hand?