October 29-31 is Family Weekend at Colby College and many events on the campus in Waterville are open to the public. All events listed except the Livingston Taylor concert on Saturday are free charge.

* On Friday at 8 p.m. the inaugural lecture of the Dr. Gerald and Myra Dorros Chair in Life Sciences will be presented by assistant professors of biochemistry Shari and Stephen Uldrich Dunham. "Metals in Biological Systems: Natural Functions and Medicinal Uses" will be presented in Robins Room, Roberts Building.

* At 4:30 p.m. Saturday in the Page Commons Room, Cotter Union "Prisons of Image," a presentation on the inappropriate use of American Indian images and culture, will be given by Charlene Teters, a member of the Spokane Nation. The 1999 Dr. Ralph J. Bunche Symposium will be followed by a reception in the Pugh Center, Cotter Union.

* At 8 p.m. on Saturday in Lorimer Chapel the Colby Symphony Orchestra will perform a concert including the premier of Dream Talking, composed by conductor Jonathan Hallstrom, Beethoven's Symphony No. 1, Brahms' Academic Festival Overture and Chausson's Poeme for Violin and Orchestra. (872.3236)

* At 8 p.m. Saturday in the Given Auditorium of the Bixler Art and Music Center, singer-songwriter Livingston Taylor will perform. Admission is $5 and tickets are on sale at the door.

* A Children's Halloween Extravaganza from 3-6 p.m. on Sunday is open to all community children age two to 10 years old. Activities include trick-or-treating, haunted houses, pumpkin decorating and face painting. Children must be accompanied by an adult. Start at the Pugh Center, Cotter Union, where campus Halloween maps will direct participants to all activities. (859.6676 or 859.6772)

* The Colby Museum of Art, home to an outstanding permanent collection, is open extended hours 10 a.m. to 4:30 p.m. Friday- Sunday during Family Weekend. View 20th-century works from the permanent collection in the Davis and Jette Galleries; 18th-, 19th- and early 20th-century works in the Lunder Wing; and works by Alex Katz in the Schupf Wing. (872.3228)