Opening parks at night seems like a completely stupid thing to do. They've always been a magnet for anti-social behaviour at night which is why they've always been closed at night as long as I've been alive, Birmingham, Wales, Liverpool... parks close at night wherever it's possible. Parks have fences / walls and gates for a reason and most of those gates and fences are as old as the parks themselves.
This just seems like one of those issues that are only an issue because of the person involved on the one side
I can only think of one park that doesn't close at night in my lived experience and that's Sefton Park in Liverpool and thats because it isn't technically owned by the council and has no wall or fences and it has a covenant preventing them from when it was donated, plus there are businesses inside its boundaries