How do you deal with noisy neighbors?

Hello, I live next door to some neighbors who, just a couple months ago, started holding gettogethers with their friends in their backyard. They can be pretty loud spontaneously and play their music loud sometimes, but not to a pounding bass level. This is on a work night and they still go on past 12:00 A.M. They do this at least one or two times a week.

I really don’t want to get into a confrontation with them because they seem like nice people and they have been friendly with us before, and they lived here longer. I’m not here by choice, as I had to move in with family because of job loss and looking for work.

They are the only ones out late at night. It seems that none of the other neighbors have come forward and told them to keep the noise level down. I wish they would just have their talks in their house or leave at an earlier time. Any suggestions would be appreciated, thanks :)