Robert Plant: The British rock singer-songwriter performs. [8 p.m. D.A.R. Constitution Hall, 1776 D St. NW] Hockey: The Washington Capitals play the Montreal Canadiens. [8 p.m. Verizon Center, 601 F St. NW]

Alvin Ailey American Dance Theater: A performance by the celebrated dance company. [7 p.m. Kennedy Center, 2700 F St. NW]

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