if under 21 do not admit that alcohol will be used. say fuckin a bunch of your friends from choir or band are coming over to watch the lion king 4 return of simba and you guys are having hawaiian punch so things might get a little out of hand. maybe give your cell # so they can call you if they think its too loud and you need to quiet it down.
if over 21 just inform them of the potential party and parking obstructions that may be occurring like you would if under 21, and just give them your cell # and tell them if they think its getting too loud or any concerns to call you.
then you setup a working relationship with your neighbors about this. Most neighbors are fine with it minus the drunk people wandering around pissing everywhere, smoking weed everywhere, people who do not realize how amazingly loud they are while outside smoking on the porch. obviously drinking alcohol with minors in front of open windows in the front of the house. and PARKING OBSTRUCTIONS, aka your friends don't give a fuck and park everywhere they damn well can, including lawns, and neighbors hateeeee your friends who slam car doors loud at 2:27 in the morning.
also your music. i suggest you do an outside music test if you haven't done so yet to verify acceptable music levels. although remember that when you test your music it is daytime, and it seems naturally (the ambient "world noise") is louder. So remember at night time you can hear a dime drop and gauge accordingly.
sparknotes - get a good relationship with your neighbors, give them your cell. you'd rather them call you to bitch than the cops.