Can I do a birthday party at the park?

U should ask city hall just in case

You can do any parties. I seen people out there

Yes

Yes, as long as you clean up after.

There's an open public benches that you can hold your party.

I think. I had seen family's reunion for different occasions. I don't know if there is any kind of permit for a party.

I've seen others do it, so I don't think there should be a problem.