STAGE

Check the Dates: Mort Sahl’s one-man show, set to begin a series of Monday night-only engagements at the Westwood Playhouse next week, has been postponed because of scheduling conflicts. . . . Actor Frank Langella has been cast as the bad guy in Howard Barker’s “Scenes From an Execution,” a play about 16th-Century arts patronage and censorship, opening March 26 at the Mark Taper Forum.