I guess fancy dress is something that is “just not done” among dubs.... I vaguely recall a C/o recounting an experience of one where things got out of hand with “elders dressed up as women!” ( shudder) . That does sound gross....
Nb. I felt like I was in fancy dress on a Sunday, wearing a white shirt and suit...
re Murder Mystery evenings, an elder of my acquaintance and his wife used to go to these at a local hotel , I guess it had food as well. They enjoyed it, and nothing was said to him.