In the wee hours of July 21, the parking lot of a county fairground in Wise, Va., was packed with families sleeping in their cars or in makeshift beds tucked between vehicles. They were camping out not for coveted tickets to a concert but for entry to a massive free medical and dental clinic. Volunteers began handing out numbers for admission at 3 a.m. The best chance for getting in when the doors opened a few hours later was to be there in the middle of the night.

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