zahavasdad,
People complain about parties when they get too loud or the like, and rare individuals may complain about them generally. But they don’t get legislation passed to stop parties, even weekly football watching parties or poker games. The key, though, is that there is no reason to complain unless you are being harmed in some way. It doesn’t hurt you if I have 40 people praying in my home’ if they don’t make noise outside your house, they don’t block your driveway, they don’t leave garbage on the street, etc. And if you are complaining about something that doesn’t actually hurt you, if it’s zeh nehena v’zeh lo chaser, you might want to be contemplate why you are complaining.