Glen Powell was the subject of a look-alike contest in Austin over the weekend—the latest in a string of social media–driven meetups in public spaces, where civilians channel celebrities in hopes of winning modest prizes and, perhaps, fleeting internet fame. In the past month alone, a Jeremy Allen White competition was held in Chicago’s Humboldt Park; men in athletic short-shorts turned up at Smithfield Square in Dublin for the Paul Mescal contest; Harry Styles–looking guys gathered in London’s Soho Square; and the real Timothée Chalamet was spotted among his doppelgängers at a New York City event in Washington Square Park.Only the Powell event, which took place Sunday at Auditorium Shores, featured cowboy hats, boots, a lot of denim, a wet T-shirt, and at least one…