Many years ago playing a ceilidh in Bevendean on the outskirts of Brighton organised by social services to help to develop 'community'. Those attending had no interest in what we were doing and viewed all the attempts by the ( very experienced) caller to engage them in dancing with deep suspicion. The atmosphere became threatening and we made our excuses and left.

Playing for a Scottish wedding in Kelso. We pointed out that we were an English band playing mainly English music but the bride, who booked us, was adamant that she wanted us to do the gig. We started, no-one danced. About 40 minutes into the set a row started between some of the guests and we took a break while other guests tried to sort it out. When we started up again there were demands for Scottish dances so we told the accordion player to play every Scottish tune he knew. By this time scuffles had broken out between the argumentative guests while one guy decided to dance on the table hurling abuse at anyone who attempted to dissuade him.
We started to pack up but when we got outside we found a bunch of guys knocking seven shades of brick dust out of each other and loading the gear proved to be very challenging.

On the plus side we did get paid but I felt really sorry for the bride and groom whose wedding turned into a car crash.