Apple does not respond to posts made in these forums. We're all just fellow users here.
And typically Apple does not donate products nor services to events like yours, no matter how worth. Apple as I'm sure you can understand gets hundreds if not thousands of similar requests every year and there would be no way they could repond to even a tiny fraction of them. There is no publicly-stated way to submit such a request, anyway. I'd suggest you contact a local independent Apple dealer and try to get them interested in supporting your show. A local business would be the most likely to be willing to contribute to such a cause and support a local educational institution.