Getting there early to claim a spot on the grass can work out. It does fill up under the shade quickly. Pizza and cupcakes work out easy. Your aloud to bring in food and drinks. No alcohol.
The have shaded areas with picnic tables there that you have to reserve through Brentwood Parks and Recreation. They will give you time slots so that noone came come and say that its their time or try and kick you out. You can do a party on thd grass area and you dont need to reserve anything.
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