I need some party ideas for 15 year old girl…?

I'm having a birthday party (turning 15) and I need some ideas...

Here's what's for sure:

-There's gonna be like 15 or so (+/-) people (age range: 13-16)
-I know I'm probably going to have dancing (in my backyard)
-Attire: Semiformal (ex: jeans and a nice blouse or something)
-It's at my house, and it's all girls

I was thinking about maybe (plz lemme know if you think this'll be good or not):

-Fire pit (S'mores?)
-Indian/Asian food (all my friends like Indian food...if not I'll make pizza or pasta or something)

Hmmm...and now I'm pretty much stuck. My mom still hasn't decided if she'll let me have a sleepover (my dad will be outta town ), what else could I possibly do? Any ideas on games or somethingg?