Honestly the park thing is looking a lot easierbiggest thing would be figuring out what is needed to reserve a spot, and then going from there. Something like this could be moved later in the year if needed and the park thing could happen first being that its probably the easiest to do logistically and when you talk putting money in to reserve a spot some people might get @ the thought of putting in money with people they haven't met in person yet, which is understandable.
Just choose a park bring your own stuff and hang seems like the best option. We could even choose a park with events/attraction.
Honestly I would be willing to rent 3 or 4 bays myself but the only thing holding me back from that is will people show up?