What should you do for your 15th birthday?

What should you do for your 15th birthday?
My 15th birthday is coming up. Im planning on inviting 10 of my closest friends. A few of them might sleepover. Its starting at 8 and finishing around midnight for those who aren't sleeping over. So during the party, what exactly should i do to make the party fun besides watch movies.

help :

PS. my parents don't really want to spend that much since Christmas is coming up.