Regarding this number of people making enough noise to disturb neighbors, consider these factors.
1. These are young people.
1. They just finished their finals and are relieved.
Also consider the possibility that if several or more are foreign and have the same lack of consideration for others that the OP seems to have. The OP said no drinking, but does that mean no alcohol or other drugs, period ? Some young people have their own definition of what drinking is. Even if there was no alcohol or illegal drugs, when was the last time you know of that many young people got together in an apartment and weren't eating snacks, drinking non alcoholic drinks and laughing and talking louder than usual ?
I wonder how much noise at 10-11pm the OP and his friends would have tolerated when they were studying for their finals ? Respecting your neighbors is important, especially if you want them to respect you.

