I am hosting a Valentine's Day dance for teenagers at my work, what can I do for fun, clean activities?

They are ages 11 - 17. A lot of hip-hop will be played by a live DJ. I need to make up a flier to advertise it, so the games/activities need to sound appealing. And these are teens from a mellow So. Cali. beach town. The teens are predominantly white with latino and asian peppered in. Thanks a million!!!