Real quick query: did you ever confront them personally about it?
I mean, maybe during the day when things are normal....and ask if they can control the noise or reduce the parties, etc.
I’ve done nothing but introduce myself and offer neighborly friendship, thinking that that would give me an in in their minds and caused them to think considerately about disturbing me. It’s just a rule of mine that if you know someone on a friendly basis, you won’t want to offend or disturb them.