It's a matter of luck...last night I took some advice I read here and didn't say I was an actress and I mentioned I was wit ha big group from school, but I didn't get picked

There were a lot of people signing up though, so who knows. They generally pick one younger kid, an older person, and two 20-30ish people. Good luck, and the show is a blast even if you don't get on stage =)
Sunchips: Best Kept Secret in the chip aisle!!