2010 Alltech FEI World Equestrian Games (WEG) U.S

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In 2006, the Dubai Sheikh's joined the endurance team. The team was made up of Sheikh Rashed, Sheikh Hamdan and Sheikh Mayed. No names so far on who will join, but expecting the boys as they are members of the team and the article does mention Sheikh Mohammed.

Group with ties to Dubai to sponsor WEG endurance event

...Sheikh Mohammed is also expected to compete at the endurance test event at the Kentucky Horse Park on Oct. 14.
Sheikh Mohammed's wife, Princess Haya Bint Al Hussein, is the president of the International Equestrian Federation, the ruling body of the Games. The sheikh also owns numerous Thoroughbred operations around the world, including Darley at Jonabell in Lexington... - Article