Ideas for wedding !!!!

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Small Covid wedding only parents and cousins total about 15 people including myself and kids

Because it’s so small we arent trying to spend much money and decided to do it in our backyard which is big enough. I rented a canopy because it might rain. But My issue is all of my backyard grass and if it rains grass will be wet which big no no.

Any ideas for flooring that I could use inside the canopy?