Devon Horse Show
Using its proper name, the Devon Horse Show and Country fair is the oldest and largest multi-breed horse show in America. It is held in Devon, PA and we've been attending for the past 10+ years. The best night of the show is the Grand Prix when riders and horses compete in the showjumping ring for seeding and Olympic placement. My iPhone camera isn't suited to the long-distance, low-light shots but you'll get the general gist of the thing.
The winning rider was McLain Ward riding Clinta and they looked pretty impressive to me. There is a good summary of the event if you are so motivated