I don't think that the two groups will overlap. Carrie Underwood is performing at the Marcus Amp. tonight, and DEVO is doing their thing at the Miller Light stage. The two fan bases shall never meet.
Underwood brings out the country fans, and DEVO has a devoted following of post-punk, new wave followers. Tonight's crowd might be thinned out with it being a holiday. I hope to get to the Captain's Deck for a cold one before joining my DEVO Devotees.