It would be great for any school to have Richard Dawkins come and talk about evolution. Two of his books are geared for children.
The Magic of Reality: How We Know What's Really True: Richard Dawkins: 9781451675047: Amazon.com: BooksSY291_BO1,204,203,200_QL40&dpSrc=detail
What Richard would say to a US Public school class is that the is NO NEED to invoke God to explain the wonders of the natural world and evolution. And he will go on to explain rainbows,biology, evolution beautifully. This is exactly what our US Constitution requires and exactly what both TIES and NCSE is doing.