An unusual and welcome exhibit designed for art lovers with physical handicaps opened Saturday at Alexandria's Torpedo Factory Art Center. "Art to See, Touch and Hear," through May 19, is a "hands-on" exhibit allowing handicapped individuals to look at, touch and hear the mixed-media works created by Factory artists. Call 683-0693 . . .

The Hard Art Gallery, 1407 15th St. NW, a multimedia art space due to close at the end of May, is holding its final series of events beginning Saturday with a film and video night. Call 745-0796 . . . The Capital Children's Museum, Third and H streets NE, unveiled Thursday J. Stewart Johnson's "Waiting to Cross." The life-size statue of a young girl is cast in bronze and is similar to Johnson's other creations at the Four Seasons Hotel and elsewhere around town . . .

Seamus Heaney conducts a seminar tomorrow at 8 p.m. and reads from his work Friday at 8 p.m. as the last author in this season's Folger Shakespeare Library "Evening Poetry Series." Call 544-7077 . . .

Georgetown University Hospital last month dedicated a new sculpture garden on its west front to the memory of Winfred Overholser III, a Washington architect who died there in 1983. The garden, a Japanese-inspired design, reflects Overholser's love for the oriental aesthetic . . .

"Art for Collectors: A Capital Choice" is an exhibition of works by 11 Washington painters who are nationally known. The exhibit is open Wednesday, Thursday and Friday through June 14 at the Federal Reserve Board, Constitution Avenue between 20th and 21st streets NW. Call 452-3686 . . . Warren Robbins, founding director emeritus of the National Museum of African Art, gives a gallery tour and slide lecture today at the Washington Project for the Arts, 404 Seventh St. NW, in conjunction with WPA's "Art in Washington and its Afro American Presence: 1940-1970." Call 287-3490.