Broadway theaters will “dim their lights” in memory of the late great Dame Maggie Smith. It’s a traditional tribute for late stars of the stage and the ‘Harry Potter’ star – who made her Broadway debut in 1956 portraying several roles in the revue of ‘New Faces of ’56’ at the Ethel Barrymore Theatre – will be honoured with a minute’s silence as the lights go out before performances at 6.45pm on November 7. Robert E. Wankel, Chairman and CEO of the Shubert Organization, a major owner of theatres in New York City, told Deadline: “Maggie Smith was a singular talent, whose artistry graced stages a…