If you haven't already figured out (and you may have not 'cause the hint isn't too obvious, especially if you don't follow the show, and you're wondering, "Why the hell are the lyrics to Don't Stop Believing on this ticket?!), the theme is...
GLEE!
Dress up as any high school stereotype (or even any cast member of the TV show, Glee!)
What high school stereotypes, you ask?
You could be the preppy cheerleader, the blur jock, the geek, the drama queen, the emo kid, the ghetto kid, the kid in a wheelchair, the one with OCD, anything! Surprise us! (and we'll surprise you ;D)
SEE Y'ALL THERE!
If you don't know what Glee is, watch these clips! :
