Alec Baldwin, Angela Bassett, Tyne Daly and Marsha Mason kick Off Broadway’s spring season into high gear (and high profile) this month.The Off Broadway season begins its spring wind-down with a slew of big-name performers hitting the stage, starting with Daly in the one-woman play “Mystery School” that opened March 11 at the Angel Orensanz Center for the Arts. Mason stars in the premiere of Michael Cristofer’s “Amazing Grace” that opened March 15 at the Theater Four, the same day the Baldwin-Bassett power duo opened “Macbeth” at the Joseph Papp Public Theater. The starry lineup continues with Alan Arkin and Elaine May in “Power Plays” at the Promenade Theater, opening April 30, and Peter Falk in the world premiere of Arthur Miller’s “Mr. Peters’ Connections” at the Signature Theater, opening May 10. In other Off Broadway bookings, the Variety Arts Theater will house “Two Pianos, Four Hands” and not, as widely expected, Kenneth Longergan’s long-anticipated “This Is Our Youth.” “Pianos” will transfer from the Promenade, where it continues to do solid business but must vacate due to the “Power Plays” booking. Other upcoming Off Broadway highlights include: - Conor McPherson’s “St. Nicholas,” starring Brian Cox, opening March 17 at Primary Stages; - Eugene O’Neill’s “Long Day’s Journey Into Night,” starring Frances Sternhagen and Brian Murray, opening March 22 at the Irish Repertory Theater; - “Dressed to Kill,” British comedian Eddie Izzard’s new show opening March 26 at the Westbeth Theater; - Martin McDonagh’s “The Cripple of Inishmaan,” April 7, Joseph Papp Public Theater; - Thulani Davis’ “Everybody’s Ruby,” also at the Public, opening May 7; - And the New York premiere of A.R. Gurney’s “Labor Day,” starring Veanne Cox at the Manhattan Theater Club, opening May 28.