Your best bet is to call and ask. There is an area with a gazebo near the koi pond & bridge where weddings have been held before. Since it's a public place, you can bet there will be spectators watching your ceremony!
You can also go to the Fort Worth Botanical Garden or the Dallas Arboretum that kind of ceremony calls for a nice place.
I don't see why that would be a problem. But there can be no glitter and no confetti. Nothing that will make the area look gross. That includes rice.
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