If you are open to the public, or are selling tickets to the public, there should be a pretty high bar to blanket ban groups of people.

And if you’re going to do that, the onus should be on you publicly list, all those people, and all the groups, and make it clear to anyone buying a ticket who is on that list.

In this case, they were banning anyone they could find connected to a law firm that was representing a person, suing them, that looks to me like it’s harassment against the law firm for taking the case.