If it's a party you can show up but if its something else I'm not sure.
I guess it depends on what kind of event? They have covered patio type areas but looks like first come first served. Meaning I haven't seen any areas closed for reservations. Should check with the park office to see if you can. I do see zumba and aerobics type classes out there.
Go explore it's a nice place to relax or exercise n i think it's first come u got that spot.
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