Name: Dressage Clinics With David Macmillan. Descripton:Keystone Equestrian is hosting a series of clinics at a discounted rate with Dressage SuperStar David MacMillan. Coach of the South African Olympic Dressage team and USDF Gold Medalist, David is a master at working with any breed, any discipline. A little dressage is good for any horse, from western to jumpers and everything in between. Contact Shirley at 435.640.2632 for ride times and dates.