SACRAMENTO -- With their fists in the air and black T-shirts on their backs, the 23-thousand fans of rock at Aftershock Saturday night look just about how you'd expect.
But concert organizers know something about them we didn't know.
"Our fan base -- they have jobs. Sixty percent of them are married. They own their own homes. They own their cars," said Danny Hayes, a chief organizer of the event.
It is that demographic profile of the typical Aftershock rocker that Hayes is underlining for good reason. This show is sold out both Saturday and Sunday. Hayes would like to eventually add another day, and get attendance each day up to 30 or 40 thousand people.
"But we've got to get the community and the county and the park comfortable with those objectives," he said.
Last year, organizers tried to get there a different way -- by moving the rock festival to Gibson Ranch north of Sacramento. There was plenty of space, and that location didn't elicit protests from groups like Save the American River Association, who've lobbied against riverside shows like this one.
But Concert goers say Gibson Ranch presented its own problems.
"Oh yeah. Last year traffic was a nightmare. We got out of our cars and partied in the street," said one concert goer.
So the event is back in discovery park, with an emphasis on keeping it clean, keeping it safe, and keeping the three stages stocked with marquee names
"You'll be sitting there and doing an interview - like I am doing with you - and then one of our favorite bands that's also playing today will walk by and you'll stop and you'll talk and all the sudden that's how tours are made," said Kemble Walters, guitar player and vocalist for the band Aeges.
And just like those up-and-coming bands who played Aftershock earlier in the day, organizers feel this isn't just a show, it's an audition for bigger shows to come.