There are a few that I know of, Pat Reeve holds on every summer in Wi. Jack Pine is another I think in Mo.(not sure) Lone Wolf also puts one on in late summer, I believe it is free to attend but you promise them first chance at all of your footage for a year in exchange for the school cost.

Huntingfootage.com would be the place to post this question as there are many semi- professional videographers on that forum.