You guys have it all completely wrong. This is my third Rufus show already, and I can tell you right now; he attracts more women to his shows than males--even homosexuals. Ok Go has quite a large male fan base too, but I'd say that the show will be inhabited by a good mix of everyone. There actually are very few "young" pop-driven girls that are into Ok Go. It'll be a lot of college-age gals and guys for Ok Go, and middle-aged women and gay men for Rufus. Or, at least, that's what Ok Go's crowd has been...it might be different due to all the press and "cutesy music video" tabs they've gotten for Oh No.
There will be very, very different crowds though. Most of my friends that are into Ok Go do NOT like Rufus (I've heard most of the same critiques about disliking his voice...), and most of the kids that I know that are into Rufus wouldn't know who Ok Go were if they hit them on the head. But, of course, I'll be there for both (moreso for Ok Go though); ever-defying the stereotypes. Yay for me.
Kosmo, you better play The Monster Mash. Where will you be, so I can come say hello? My friends and I will be the girls dressed up as OK Go...I'm assuming that the "I'm-So-Hipster" DC crowd will majority NOT be actually dressing up. You should see how they do Halloween shows in LA...insanity...& so much more fun there.