To encourage participant interest and interaction with the sport, they should have a horse gearing contest using a full set of harness including boots and those plastic horses they model horse rugs on. Aim is speed to gear up the horse and proper fit.
Level 1 is non-horse people with no instructions, Level 2 is non-horse people with instructions, Level 3 is harness industry people. Film it and use it for promotion. It would be hilarious and so easy to go viral