British Show Horse Association was created in 1935.
Horse Show Fountain was created in 1909.
British Show Jumping Association
Monmouth County Horse Show was created in 1895.
BSJA. - Britsh Show Jumping Association
IEA-Interscholastic Equestrian Association At least that's the one I'm familiar with
Perfect Match - British game show - was created in 2002.
Check out the local horse publication in the area, or contact the miniture horse association in the area (a simple google search should do the trick)
I would suggest contacting the Arabian horse Association or perhaps someone who was at that particular show as the theme does not seem to appear anywhere online.
The Hackney Horse is a very old British breed used for riding & driving. The Hackney Pony is a derivative of the Hackney Horse & British ponies, developed in the late 1800s for show ring driving.
You can start by competing in BSJA (British Show Jumping Association) competitions if you live in Britain. Then move on to HOYS (Horse Of the Year Show) amd just keep jumping bigger and better and get noticed by owners of exiting horses wihch they may let you ride.
The show was created by Christy Hui in association with Warner Bros. Animation.
Bri-Ellen Lee Millsap and her horse named Jac Chex King or Chex they still ride together to this day. And are mostly barrel racing event.