In October 1976, as preparation for the World Championships, EEI organized the first horse trials ever held at the Horse Park. In 1977, the organization coordinated the staging of the national Pony Club Rally in August and produced the North American Junior Three–Day Event Championships in September.
The 1978 World Three-Day Event Championships, held for the first time in the United States September 14–17, were an unprecedented success. (See the original 1978 Time Magazine story on the event here.) Individual World Champion Bruce Davidson of Pennsylvania retained the world title by riding his young, courageous American Thoroughbred, Might Tango. The popular team of riders and horses from Canada won the Team Gold Medal.
Over the years, spectators from all over the world visited the Kentucky Horse Park to witness these amazing horse and rider pairs. In 2023 over the four days 89,000 people were in attendance from 15 countries, all 50 US states and over 2,000 cities worldwide.