well considering its actually illegal to suplly alcohol to a minor even if it is on your own property i would seriuosly consider after having a chat witht he parents (ifs thats what you are planning on)

then taking the invite down to the loacl police station, they are becooming more and more fed up with what children are allowed to do lately so they may take notice and if they are aware it could inculde a visit beofre or during the party to the parents.