I tend to assume that a party that is already in progress, especially with alcohol involved, is not going to quiet down, and is not going to stop unless the cops or something similar are involved. A camp host MIGHT count.
When I was at Yosemite earlier this year, I looked askance at a large family group that had set up on several adjoining sites next to us. They had 40-50 people, sharing all meals, campfire, etc. But they were surprisingly quiet! And they picked the right cg for it, one with huge sites, so there was some spatial separation.
So, there ARE nice campground partiers :).