I just finished 3 hours of demonstrating cotton spinning. It was not 700 kids (thank goodness) but it was a steady flow of kids and their parents for 3 hours. I would estimate 150-200 kids although some of them felt like 700 kids all by themselves!!
But it was so much fun to watch them as I explained that their jeans and cotton tees started out as the little fluff of cotton they were holding. They each got a cotton seed and I'd started a couple growing last weekend that were an inch or so tall. So I think there are going to be lots of cotton plants in Springfield this summer.
Here's what my booth looked like: