Who is the audience (horsey people or non-horsey people)? Will you have an actual horse to do the demonstration on?
For non-horsey people, you could do something basic like demonstrate how to groom a horse- what the different types of brushes, how to use them, how to pick out the hooves, etc.
For people who are already somewhat knowledgeable about horses, you could do a saddle fitting demonstration and bring a saddle that fits the horse, along with one or two that don't, and point out how you can tell if the fit is good or bad.
How about how to measure the saddle properly, how to tell the tree style, what type bars, gullet and cantle measurements along with seat measurements and how to pick a saddle that fits the rider as well as the horse, then this way you don't need a horse just a few saddles. Posted via Mobile Device