Student Choregraphy Concert. Boston Conservatory, 8 p.m. Friday and Saturday, April 21 and 22 at 8 p.m. Free.

Student Chamber Concert. Friday, April 21, 7 p.m. Sunday, April 23. Free.

Senior Choreographers Concert, "Four Women." Boston Conservatory Theater, 2 p.m. Sunday, April 23. Free.

Boston Conservatory Chamber Ensemble. First and Second Church, 4 p.m. $7 for students. Sunday, April 23.

Chorale Concert. Seully Hall, 8 p.m. Tuesday, April 25.

Boston Conservatory Wind Ensemble. Seully Hall, 8:30 p.m. Wednesday, April 26, 8:30 p.m.

Longy School of Music. Edward M. Pickman Concert Hall, 27 Garden St., Cambridge. 876-0956, ext. 120. Apple Hill Chamber Players on Friday, April 21 at 8 p.m. Pianist Marian Rashkovetsky and Lilia Muchnik, violiniost, present an all Russian program on Sunday, April 23 at 8 p.m.

Dance

Alvin Ailey American Dance Theater. Through April 30. Their movement carries you along from one emotion to the next, using modern jazz, ballet, Afro-Caribbean and much more. Contact Bank of Boston Celbrity Series for ticket information at 482-2595. Wang Center.

Earth Day Sunday Festival

First parish in Cambridge, Mass Ave. and Church Street. Sunday, April 23 from 1 to 5 p.m. Singalong with Fred Small, Barbara Herson and Doug Albert. Keynote speaker John Kenneth Galbraith. Activities for kids.

Exhibitions

The Children's Museum. 300 Congress Street, 426-8855. Current exhibits include: the Climbing Sculpture, a two-story suspended puzzle piece climbing maze; Climbing the Wall, a rock climbing exhibit; El Mercado De Barrio, a replica of a Latino neighborhood market in Boston; Teen Tokyo, an exhibition on fashion, food, sports, music, art, and school and family life for kids in Japan; Jump Up! Boston's Caribbean Carnival; and Powwow, an exhibition of photographs of Arapahoe and Shoshone powwows.

Hart Nautical Gallery. 55 Mass Ave., M.I.T., Cambridge. 253-5942. Ongoing "Course 13, 1893-1993: From Naval Architecture to Ocean Engineering." "Permanent Exhibition of Ship Models."

M.I.T. Museum. 265 Mass Ave., Cambridge. 253-4444. Through June 18. "From Louis Sullivan to SOM: Boston Grads Go to Chicago." Through drawings and artifacts, this exhibition explores the explosive growth of the city of Chicago in the last quarter of the 19th century and the contributions to this buildingboom by MIT and Boston architects.