I had an event there that ended before 9pm it was safe and we fed many people
Yes
If is something for kids, something really small, not too loud, i think it will be fine.
What kind of event? This playground is next to a school and in a residential neighborhood so anything loud or during school hours that brings much of a crowd is going to probably draw ire and possibly the police. Also, of course, this is a playground, so if people are hanging out without kids, it could draw attention. If you're talking a kids party though, likely you should have no problems.
Yes you can
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