Some camera companies (we have already mentioned Adorama and B&H but, there are others) conduct free or low cost seminars.
Calumet Camera used to hold regular seminars free or low at cost in all phases of photography and post production. Luckily, I lived near a Calumet store...
Unfortunately, Calumet suddenly went belly up leaving a void. George's camera of San Diego opened a new store which has a room set aside for seminars and seems to be holding these seminars regularly. The actual grand opening is planned for this weekend but, they have been in business at the new location for a while now. I have attended a series of presentations by Canon and plan to attend two more presentations today...
Perhaps camera stores in other areas also hold seminars. That might be a good area to research...
At a slightly higher price, well known photographers, such as Scott Kelby, frequently hold seminars in larger U.S. Cities. I research these presentations because I don't mind attending a free lecture on areas in which I don't need training (I might just pick up a bit of information) but, hate to pay significant amounts of money for something that will not benefit me...