KETER BETTS -- 8 p.m. Friday. The jazz bassist and his trio perform as part of the Montpelier Cultural Arts Spring Jazz Series. Montpelier Cultural Arts Center, 12826 Laurel-Bowie Rd., Laurel. $15. 301-953-1993.
IZOLDA AND FOLK NOUVEAU -- 8:30-10 p.m. Saturday. Riverdale Bookshop and Coffee Depot, 4701 Queensbury Road. Riverdale Park. Free. 301-277-8141.
CONCERTO COMPETITION -- 1 p.m. Sunday. Undergraduate and graduate soloists perform as part of the University of Maryland Symphonic Orchestra's preliminary round of the 2003-04 Concerto Competition. Gildenhorn Recital Hall, Clarice Smith Performing Arts Center, Stadium Drive and Route 197, College Park. Free. 301-405-2787.
BERTELL KNOX & GENERATIONS -- 2 p.m. Wednesday. Afternoon concert. Refreshments provided. Harmony Hall Regional Center, 10701 Livingston Rd., Fort Washington. $6. 301-203-6070.
REPTILES -- 11 a.m.-noon Saturday. Reptile fun for all ages. Watkins Nature Center, 301 Watkins Park Dr., Upper Marlboro. $2; non-residents, $1. 301-218-6702.
ARTS AND CRAFTS -- 11 a.m.-noon Saturday. Craft decorating for ages 6-12. Glenn Dale Community Center, 11901 Glenn Dale Blvd., Glenn Dale. $6; non-residents, $5. 301-352-8983.
MODEL-MAKING WORKSHOP -- Noon-4 p.m. Saturday. Model-making technique workshop given by the International Plastic Modelers Society for ages 8 and up. Plastic aviation models provided. College Park Aviation Museum, 1985 Cpl. Frank Scott Dr., College Park. $3 in addition to regular admission fee: adults, $4; seniors, $3; students and children under 18. 301-864-6029.
BON APPETOTS -- 2-3 p.m. Saturday. Parents make treats with their preschoolers (ages 3-5). Lake Arbor Community Center, 10100 Lake Arbor Way, Mitchellville. $6; bi-county residents, $5. 301-333-6561.
"CHOICES AND CHALLENGES: WOMEN IN HISTORY" -- 5:30-6:30 p.m. Monday. Program for ages 6-17 exploring famous women throughout history. Huntington Community Center, 13022 Eighth St., Bowie. Free. 301-464-3725.
SHAMROCK SHUFFLE -- 3 p.m. Wednesday. For ages 7-10, shamrock crafts, games and green snacks in honor of St. Patrick's Day. Langley Park Community Center, 1500 Merrimac Dr., Hyattsville. $2; bi-county residents, $1. Reservations, 301-445-4508.
Sports and Recreation
WEIGHT ROOM WORKOUT -- 6:30 a.m.-10 p.m. Monday-Friday, 9 a.m.-7 p.m. Saturdays and Sundays.Adults exercise to music. Kettering/Largo Community Center, 431 Watkins Park Dr., Upper Marlboro. $30 per week; bi-county residents, $15 per week. 301-390-8390.
DEEJAYED ICE-SKATING NIGHT -- 7-10 p.m. Friday. Skate to music. Herbert Wells Ice Rink, 5211 Paint Branch Pkwy, College Park. Includes admission and skate rental. $8. 301-277-3717.
BIRDING THE PATUXENT -- 8-11 p.m. Saturday. Boat trip and Patuxent River tour for serious birders ages 18 and older. Patuxent River Park, 16000 Croom Airport Rd., Upper Marlboro. $6; non-resident, $5. 301-627-6074.
CHESAPEAKE BAY CRITICAL AREA DRIVING TOUR -- 10 a.m.-3 p.m. Sunday. A self-guided, four-mile driving tour with interpretive stops, an observation tower and a timber bridge over scenic wetlands. Patuxent River Park, 16000 Croom Airport Rd., Upper Marlboro. Free. 301-627-6074.
AQUA KICKBOXING -- 7-7:45 p.m. Tuesdays. Underwater kickboxing class for ages 18 and older. Glenarden/Theresa Banks Complex pool, 8615-A McLain Ave., Glenarden. $6; bi-county residents, $5. 301-772-5515.
"DECLARATION OF (IN) DEPENDENCE: THE STORY OF SALLY HEMINGS" -- 8 p.m. Saturday. Dance-theater performance combining historical and artistic perspectives about Sally Hemings, a slave who is believed to have been the mistress of Thomas Jefferson. Ages 13 and up. The Publick Playhouse, 5445 Landover Rd., Cheverly. Tickets: $12. 301-277-1710.
Lectures and Literature
JOSH BARR -- 3-5 p.m. Saturday. Washington Post sportswriter signs "Good Enough to Be Great: The Inside Story of Maryland Basketball's National Championship Season." Borders Book & Music, 4420 Mitchellville Rd., Bowie. Free. 301-352-5560.
DOS MUJERES: FRIDA KAHLO AND SOR JUANA INES DE LA CRUZ -- 7 p.m. Saturday. Gregorio Luke, director of the Latin American Art Museum in Los Angeles, gives an audiovisual lecture about the life and works of the two Mexican artists. El Palenque Cultural Space, Latin American Folk Institute, 3800-A 34th St., second floor, Mount Rainier. $5. 301-887-9331.
"WE THE CHILDREN: A HISTORY OF AFRICAN AMERICAN CHILDHOOD" -- Through Saturday. An exploration of the simple pleasures of childhood and the historic realities that have confronted black Americans. Harmony Hall Regional Center, 8701 Livingston Rd., Fort Washington. Free. 301-203-6070.
"SCHOOL OF FISH" ART -- Saturday through April 3. An exhibition of the work of former students of John Krumein, a professor for 30 years at Prince George's Community College. Marlboro Gallery, 301 Largo Rd. Largo. Free. 301-322-0920.
LAUREL ART GUILD EXHIBITION RECEPTION -- 2-4 p.m. Sunday. Reception and awards ceremony for artists exhibiting in the Laurel Art Guild Exhibition and the Resident Artists Gallery at Montpelier Cultural Arts Center, 12826 Laurel-Bowie Rd., Laurel. Free. 301-953-1993.
WOOD-TURNING -- Through March 30. Handcrafted bowls, vases and sculpture created by the Chesapeake Wood Turners. Montpelier Mansion, 12826 Laurel-Bowie Rd., Laurel. Free. 301-953-1993. Free. 301-953-1376.
RADIO PREMIUMS -- Ongoing. Memorabilia related to the radio serials of the 1930s, '40s and '50s, including "Little Orphan Annie," "Buck Rogers in the 25th Century" and "Captain Midnight." The Radio-Television Museum, 2608 Mitchellville Rd., Bowie. Free. 301-390-1020.
"PICTURING VICTIMS AND PATRIOTS: PHOTOGRAPHS FROM THE DEPRESSION AND WORLD WAR II" -- Ongoing. Photographs illustrating New Deal social welfare programs. Photographers include Gordon Parks, Walker Evans, Marion Post Wolcott, Russell Lee, Arthur Rothstein and John Vachon. Greenbelt Museum, 15 Crescent Rd. Free. 301-507-6582.
"THE FORGOTTEN WAR REMEMBERED: AMERICA AND THE KOREAN WAR" -- Ongoing. Includes 20 photographs chronicling the war, from the growing tensions during the late 1940s through the signing of the armistice in 1953. National Archives at College Park, 8601 Adelphi Rd. Free. 301-713-6800.
HOLLYWOOD FLIERS MOVIE SERIES -- 11 a.m. Friday. Showing of "The Real Flying Tigers," a documentary about the bomber squadron. College Park Aviation Museum, 1985 Cpl. Frank Scott Dr. Free with museum admission: adults, $4; seniors, $3; students and children under 18. 301-864-6029.
BLACK MEMORABILIA AND COLLECTIBLES SHOWCASE -- 3-8 p.m. Saturday. Mamie Peanut Johnson, the first female baseball player in the Negro Leagues, guest-hosts a memorabilia sale. Prince George's Sports & Learning Complex, 8001 Sheriff Rd., Landover. $3, children 18 & under, free. 301-583-2582.
SILK ROAD DANCE ENSEMBLE -- 8 p.m. Saturday. Performance of dances from all over Central Asia and the Middle East. Joe's Movement Emporium, 3802 34th St., Mount Rainier. $12; students, $10; ages 16 and under, $6. 301-699-1819.
AFRICAN FILM SERIES -- 6 p.m. Sunday. Screening of "Kirikou and the Sorceress," followed by a discussion with Anne DiLallo, a scholar from the District's School Without Walls. Joe's Movement Emporium, 3802 34th St., Mount Rainier. $5. 301-699-1819.
Prince George's Extra Weekend section lists events as space permits. Mail notices noting date, time, address, cost and phone number to Weekend Section, The Washington Post, 14402 Old Mill Rd., Upper Marlboro, Md. 20772. The deadline is 10 days before publication date.