Does a park patrol come by after 7:30pm to make sure every leaves at closing? What happens if you're parked up there, I read the gate automatically opens to let people out after closing just no entrance.

Yes, we have daily security and part of their job is to ensure that cars and people leave at closing time. Cars that are left after closure are towed.

We got there before a summer sunset, and were kicked out before the sun set.

I don't know if they come every night but they do check.