Yup you need women friends. Or just social group if not true friendships

Honestly I think these particular type of venues and events attract this kind of men and some might even go there by themselves (from what you share majority are actually married or in a relationships) in order to hook up/cheat. They might assume women are there for the same reason.

Alcohol is involved and many if not all intoxicated to various degrees are if pot is legal in your state they might be high as a kite.

I don’t think going alone places makes you a prey for inappropriately behaving men. Going alone to these kind of places makes it more likely to run into trashy men.

FB groups (that meet in real life) or meetups is a good idea. I don’t know if you could set your preference for only women groups on FB but you could do that on meetup. In my experience most mixed groups are groups where people go to find a date. Just for friendships go for all female groups only