I would try to avoid any risk as much as possible. Do you know what time they are supposed to show up? I’d seriously think about not going to WorldCon76 if I were you. Alt Right and Antifa are a menace in my opinion. I’m all for protesting, with permits, but not for violence. Why are these groups picking to go to WorldCon? Why do they feel the need to disrupt that event? I know you said you didn’t want to go into it, but is there a one sentence brief? Can you go Friday or Sunday? Avoid Saturday.