I believe that xman and Jock have good ideas. You don't have to be the slave of people acting badly. If that causes strife, then it's not on your head. I would make it plain again that overindugence is not OK, and I would also limit the amount of alcohol present. And make it plain that flasks are not OK as well.

Sure diplomacy is required, but that goes around. If you believe them to be alcoholics, then it is important that you not enable or allow them to draw you into the sickness. If they simply young and impetuous people, then you don't have to play.

Maybe I'm just old and crusty, but I will not be a party to rude or embarrassing behavior like that. I frew up in an alcoholic home, and I won't do that again. I enjoy a drink now and then, but I won't be a part of a friend's overindulgence, whether it's imprtuous or pathological. The DSM gives some pretty good guidelines, but even if it's not a sickness, it's not desirable either.

You just don't have to tolerate it in your own home. I like the "Am I going to have to cut you off?" approach. And then cut off and/or call a cab.

Good luck.