Get a behind-the-scenes look into the making of Frederick Wiseman's City Hall as the legendary documentarian is joined by Boston Mayor Marty Walsh and GBH President and CEO Jon Abbott for a special hour-long conversation. Called one of the best films of 2020 by The New York Times, Wiseman's four-and-a-half-hour epic spotlighting the tireless and essential work of Boston's public servants premiered December 22 at 8pm ET on GBH 2.