How many people go to the fair by themselves?? If you need 36sq ft per person, you would have room, but it would be one crazy dance with people moving around, would need people standing on tractors and displays also to get each square foot. The other part would be some places have multiple levels so if a building has two floors that would double the squre feet of that space.
I was referencing Walmarts alleged 200 sq ft per person restriction. The math might or might not work out on that, but in practice, people group up regularly.