I presume you're talking about the US public school system which is not what we in the UK mean by "public school"! However, there is a superb organisation in Newcastle with Alistair Anderson as co-director, called Folkworks, that does tremendous work with schools (as well as people from early childhood to the twilight years). More importantly it works with teachers to give them the skills to work with students in all aspects of traditional dance, music, song, story etc. Perhaps someone could start a US branch - although I'm sure someone, somewhere will be able to tell us that it's already being done!