Next door neighbors have converted an outhouse into an Airnib rental which borders directly onto both my garden and three neighbors. Other than living next to what feels like a public car park with patrons arriving all hours it's not something I stress over. Yesterday the car park was decked out with marquees, chairs, flags and a sound system. Live music followed. If it were a neighbor having a private party I'd silently grumble and let it pass. However, AIBU to feel this is a step too far? Any suggestions on how to nip this in the bud without confrontation? Asking for two fellow neighbours too!