Lesley Nicol, who plays Mrs. Patmore on "Downton Abbey," is performing in a one-night-only show at the end of this month. The show, called "Admission: One Shilling," pays tribute to Dame Myra Hess, famous in Britain for her piano concerts during World War II. The show is free, but you need to mail your request for tickets in starting today. Full details at the International Music Foundation's website.