Staffers at 9:30 Club and other iconic D.C. concert venues petition for union recognition Courtesy EXCLUSIVE: Workers at some of the most renown music venues in Washington, D.C., have won their unionization efforts. IMP notified some of its staffers at the 9:30 Club, The Anthem, The Atlantis and Lincoln Theatre Wednesday that the company would voluntarily recognize the employees' desire to form a union with Unite Here Local 25, Deadline understands. Now, they will move to negotiate their first union contract with IMP.