They are a lot of great horse show and circuit around the world. In recent years, Spruce Meadows has been my favorite. Because the organization and management is extremely professional. The hospitality for the exhibitors and public make a very special experience. The grass competition arenas is one of the best in the world. The passion for horses and for the sport of show jumping is evident in every aspect of the way they run their show. I would recommend it for everybody, to the pony until the top level horse.
(And also, one on my favorite horse show is Upperville, VA.)