What to do for a 15 years old bday party?

i live in miichigan and my birthdays in feburary so ots winter tiome here a really cold outside i wana have some friends over for my bday party but i dont really want them around my parents but we cant really go outside so any i dea on what to do i was thinking a sleepover jsut bc its easy to do but i think i gettin a wee bit to old for that lol so any other suggestions on what to do? or maybe a way to have a sleepover but nit make it seem like were lil kids lol thanks for the help guys appreecaite it:D