Bluegrass Festival Week 2. The annual Platinum Performance/USHJA Hunter Championship Week featuring the Platinum Performance/USHJA Green Hunter Incentive Championships and Platinum Performance/USHJA International Hunter Derby Championship is held in Lexington, Kentucky. More than 300 of the country’s top Hunter horses and riders will take to the Kentucky Horse Park’s Rolex Stadium for five days of competition amid the Bluegrass Festival Horse Show.