What to wear to club La Vela teen night?! :D?

I am 15, and going to PC teen night at this club. I heard it's pretty fun! But I'm not sure what to expect as what to wear. I have a cute tan loose dress and some tan heels that are nice. http://www.rue21.com/Merchandise.aspx?GenderID=1&CategoryID=17&page=3 its the 4th dress and i fill it well. to dressy? Or maybe white short shorts and a nice shirt with a necklace and sandals? Or a denim dress with Toms? I have no clue. Any help would be great:) I am tall, 5'8 and weigh 135!