I have a similar problem, I do swing dancing and all the information for dances in my area are exclusively posted on Facebook by a wide variety of people who are putting on the dances. I can try and go to each individual organizing a dance and try and get them off Facebook, but that's making their job harder when we've already had lots of people stop organizing events post-COVID, and the system they have now seems to really work for getting new people into dancing that haven't done it before with lots of new faces each dance. So I just go along with it.