Someone please, im a troubled teen in need of advice.?! D: (weed)?

Tell your parents that you made a stupid mistake. Tell them what you've just told us. That she's moving and you are good friends and that her parents will be there. Bargain with them. Promise to do something like clean or give back your internet privileges for this one party. Unfortunately you made a mistake and now you have to deal with the consequences. The ones now and in the future.