The Trial. A comedy by Allan Piper. Loeb Experimental Theatre, 7:30 p.m. Free.

Posthumous Improvisations. By J. Eric Marler, graduate student in English. Leverett Old Library, 8 p.m. Tickets are available at the Holyoke Center Ticket Office or at the door. 22 April Saturday

Concert

Currier House Music Society. Currier House students offer a program including works by Brahms, Milhaud and Mozart. Senior Common Room, 8 p.m. Free. Reception follows.

Dance

A Spring thing. A medley of original choreography, contemporary and classical ballet presented by the Harvard-Radcliffe Ballety Company. Agassiz Theater, 8 p.m. $5 for students.

Film

Harvard Film Archive. Carpenter Center for the Visual Arts. 24 Quincy St. 495-4700. $5 for students, unless a special event. "Judex 2" at 7 p.m. "The Maestro Sworn to the Drum" at 9 p.m.

Talk

Women in the Museums: Artists and Images. Ann Read, Art Museums docent. Fogg Art Museum, 11:30 p.m.

Theatre

A Streetcar Named Desire. By Tennessee Williams. Agassiz Theatre, 2 and 8 p.m. $5 for students.

Guys and Dolls. Cabot House, 8 p.m. $5 for students; $5 for Cabot residents. Call 495-8749 for more information.

The Trial. A comedy by Allan Piper. Loeb Experimental Theatre, 2:30 and 7:30 p.m. Free.

Posthumous Improvisations. By J. Eric Marler, graduate student in English. Leverett Old Library, 8 p.m. Tickets are available at the Holyoke Center Ticket Office or at the door. 23 April Sunday