I had a neighbour who was a quiet as a mouse for months on end but once or twice a year had a seriously loud party. He was a lovely guy. His guests were all well behaved. He let the neighbours know and invited them to drop in. It did not precipitate a proliferation of party-holding by others. 99% of the time all was very quiet. I would stop fretting and let this one through to the keeper. If it becomes a too-frequent occurrence, then do something about it.