that's a good idea. i've wondered if other places have ordinances as restrictive as ours (i.e., no masks for people over 12 years old on public property), or if they have them but they have exceptions, or aren't enforced very closely, or what exactly. i think the RLSH community would be a good source of info.
I found out that they tell the police who they are, what they look like in costume, and why they are there. Of course, a lot of those folks are there for citizen-policing, where I'm just trying to stay out of trouble while bringing smiles to people, so I think if I stick to shows where I can contact show management ahead of time, that's probably my best bet.
There aren't many free shows on public land here, such as our labor day celebration at the park, and that would probably be one to call the police business line about, just to touch base and make sure there wouldn't be any problems.
I don't look enough like Carrie Fisher to go as Princess Leia, so Chewbacca was my only other available choice for my budget, at least for Star Wars characters. It's tough being an older female just starting out with all the things like being a haunter for Halloween and then cosplaying other times of the year.
I've missed out on a lot. But that's also why I'm going to be a female wookie--I get to choose how she looks, like strapping my glasses to the outside of the mask, and I don't have to wear stilts to get the height.

People might think it's silly, but of course it is, lol.