Hah! When I was studying King Arthur mythology, a lot of the scary fae stories were early Christian propaganda about how weird the heathen rites and customs were.

Edited There were a lot of stories like the movie Midsommar where some knights would seek shelter from a storm at a far-removed keep, and the steward would say you can come in, but it's the day of ₮ⱧɆ ₣Ɇ₴₮łV₳Ⱡ which you may not like and it turns out the festival includes mortal-stakes gaming or tourneys to the death or an obligatory feast dining on human meat or something else.

ETA For some reason it feels relevant having watched Trump's town hall meeting turn into a music appreciation show with extra helpings of Ave Maria. Fey were renowned for infiltrating human organizations, gaining high rank and then turning their events into mockeries of themselves. And this was totally that.