Not sure if you meant this as a joke or not, but seriously you could do this Bob if you wanted. I have an account with
GoToMeeting, and it's a phenomenal service. My account allows 11 consecutive users, and everyone involved could view your computer screen live and can telephone into a conference group for naration and discussion. The only cost to you and your viewers would be the toll call (if they are long distance to area code 425).
I can talk to you about it this weekend, but it might be a good way to reach out to those out of the area and interested in your seminar.