DISCUSSION: Learn all about aliens and their connection to the government when journalist Annie Jacobson discusses her new book, Area 51: An Uncensored History of America’s Top Secret Military Base, which claims to feature recently declassified documents and eyewitness accounts. There will also be a screening of the National Geographic documentary Area 51 Declassified, featuring never-before-seen footage. At the International Spy Museum at 6:30 PM; free.
Or have another close encounter when Leonard Nimoy visits Rockville’s B’nai Isreal Congregation. The actor, best known for his role as Spock on Star Trek, will discuss his time on the series, his charity work, and more. 7:45 PM; get tickets ($36) here.
PARTY: Union Jack’s in Bethesda is opening its outdoor patio for the season. Starting at 4, the pub will be serving $2 Corona and Bud Light, plus 50 cent wings. At 9, take a ride on the mechanical bull. No cover.
OPERA: The final show of the Washington National Opera’s season is Don Pasquale, at the Kennedy Center through May 27. The comedic opera stars Baltimore native James Morris in the title role; Plácido Domingo and Israel Gursky conduct on alternate nights. Buy tickets ($25 to $300) at the KenCen’s Web site.