CANCELLED At the U.S. Open's annual kickoff event for families, you'll have to pony up to see the stadium show, but grounds events are totally free. Mini pros can get autographs, try out simulations, take skills clinics or even play matches on the outer courts. Even if they're not big on stringing aracquet, they can still enjoy hair braiding, face painting, storytelling and the Hess Express obstacle course. (Hey, a little coordination is never a bad thing!) All ages.