[Utah-astronomy] Do I have permission...?

Hello. This is Mark Saengsoury. I was curious about something. I've been wanting to get out a couple of nights a week and head on over to a park such as Winchester or Wheeler to stargaze a bit. I don't have the freetime to head out to a darksite so it's my next best option. When SLAS sets up public star parties at parks, do we ask permission from the city hall or whatnot? Or do we just settle on down whenever we want? I'd like to spend a couple of hours in a park, but I know parks give warnings that they close at like 10 pm or so. Would I be okay just hanging out there after hours or would I have to get some kind of permission?