The Sundance Film Festival prepares to bid farewell to Park City, and Robert Redford

The Sundance Film Festival may be a little bittersweet this year. It will be familiar in some ways as it kicks off on Thursday in Park City, Utah. There will be stars, from Natalie Portman to Charli XCX, and breakout discoveries, tearjerkers, comedies, thrillers, oddities that defy categorization and maybe even a few future Oscar nominees. The pop ups and sponsors will be out in full force on Main Street. The lines to get into the 90 movies premiering across 10 days will be long and the volunteers...