We've had a few parties, and no real damage apart from a chipped kitchen worktop. The mess is always horrible, but they clean it up. It's always loud, but it's just one night. And there is always some vomiting even when they're 18.
But the first one my dd1 had (where I made the mistake of going out but leaving an au pair in charge) had so many vomiting girls, plus a gang of boys from a nearby school arriving with knives, the police coming and a huge number of complaints from the neighbours (from several streets away). All the paralytic girls were from a private school nearby - they were in a horrendous state.
Apparantly that party went down in the records as a legend. I banned parties after that.
But I didn't learn my lesson because I agreed to have one for one for dd2 which had a vomiting girl on the floor (vodka). I had to call her dad. They were only about 15 I think.
The next one for dd3 had me staying in all the time, checking the so-called water bottles (vodka). No vomiting I think. Just loud.
dd2 and 3 had some gatherings this summer in the garden mostly to celebrate end of A levels and gcses. I got accosted in the street by a random woman. There's a whats App group in the neighbours which I'm not a member of, but where my kids and their gatherings seem to be a subject of discussion.