Every August since 1978, a city within a city has popped up in Flushing Meadows, Queens. In just a few weeks, the corner of an almost 900-acre public park is transformed into the United States Open, along with its six fully staffed restaurants and 60 concessions stands, 20 stocked and staffed stores, five active loading docks, dozens of artfully landscaped tennis courts and strolling areas, a police force the size of a small Montana town, and three stadiums filled with passionate tennis fans, some of whom will probably soon be dancing the “Whip/Nae Nae” for the “spider cam” at Arthur Ashe Stadium.