Is Buena Vista Park closed at 11:45 AM everyday? Do people in the park at that time have to leave?

The park closes sometime between 10pm to midnight and opens around dawn, but I do not believe that is enforced very much

No, it's open at 11:45am

Absolutely not

Depend on who's ask. There's unwritten rule, it is close at sunset and open at sunrise for public, but it does open for certain people.

It never closes