• High Fidelity opening night. Imperial Theatre, 249 W. 45th St., nr. Broadway, 5:30 p.m. Nick Hornby, Hope Davis, Alec Baldwin, Rachel Dratch, Lauren Bacall, Bebe Neuwirth, and David Hasselhoff expected. Free premise for aspiring "Shouts & Murmurs" writers: What if Nick Hornby had written Baywatch?
• The Lost Room premiere. Stone Rose Restaurant, Time Warner Center, 10 Columbus Circle, nr. Central Park S., 6 p.m. Stars Peter Krause and Kevin Pollack will be there in support of this SciFi Channel production. The tagline, "Some doors are better left unopened," is accompanied by an ad campaign with life-size fake doors. Or maybe those are ads for a different movie whose tagline is "Some doors are impossible to open."
• USO Metropolitan Gold Medal Dinner and Armed Forces Gala. Cipriani, 110 E. 42nd St., nr. Vanderbilt Ave., 6:30 p.m. Bud Selig, the Donald Rumsfeld of baseball, is expected.
Or, check out all our Agenda listings for tonight, selected by New York's culture editors.