I like the historical presentations. You can do a dozen different seminars just on history, for instance:

History of Riverboat Casinos
History of Atlantic City Casinos
History of Indian Casinos
History of Deadwood Casinos
History of Reno Casinos
History of Downtown LV Casinos
History of LV Strip Casinos
or
History of LV Casinos in the 50's
etc.
etc.
etc.