HYATTSVILLE CHESS CLUB, for all ages, tips from instructor Ted Fagan. 7 p.m., Hyattsville Library, 6530 Adelphi Rd., Hyattsville. Free. 301-985-4690.
ONLINE HOMEWORK HELP, for students in grades 4-12, tutoring in math, science, social studies and English, from teachers, university professors and graduate students. 2 p.m.-midnight daily; Spanish-speaking tutors in math and science, 2-10 p.m. Sundays to Thursdays. Available through the Prince George's County Memorial Library System's Web site, www.pgcmls.info.
SENIOR CENTER BINGO, for people 55 and older. 9:30 a.m.-2 p.m. Fridays and Tuesdays, Camp Springs Senior Center, 6420 Allentown Rd., Camp Springs. Free. 301-449-0490.
YOGA DEMONSTRATION, for people 60 and older, representatives from Holy Cross Hospital demonstrate seated yoga. 11 a.m., Langley Park Senior Center, 1500 Merrimac Dr., Langley Park. Free. 301-408-4343.
OLD SCHOOLHOUSE, tours of a one-room schoolhouse built in 1896, sponsored by the Maryland-National Capital Park and Planning Commission. 11 a.m.-3 p.m. Friday and 1-4 p.m. Sunday, 6116 Seabrook Rd., Seabrook. Free. 301-464-5291.
GAMES AND CRAFTS, for children ages 5-12. 3 p.m., Largo-Kettering Library, 9601 Capital Lane, Largo. Free. 301-336-4044.
COLLEGE PARK FARMERS MARKET, sponsored by the Maryland-National Capital Park and Planning Commission. 7 a.m.-noon, Ellen Linson Swimming Pool parking lot, 5211 Paint Branch Pkwy., College Park. Free. 301-277-3717.
CANOEING LESSONS, for children 10 and older, accompanied by an adult. Canoes, paddles and life jackets provided; bring a bag lunch. 10 a.m.-2 p.m., Bladensburg Waterfront Park, 4601 Annapolis Rd., Bladensburg. $25; nonresidents of Prince George's and Montgomery counties, $30. Registration required. 301-779-0371.
VINTAGE TV PROGRAM, "The Admiral Broadway Revue," an episode of a 1949 series starring Sid Caesar and Imogene Coca, a precursor to their 1950s TV comedy, "Your Show of Shows." 1-4 p.m. Saturday and Sunday, the Radio and Television Museum, 2608 Mitchellville Rd., Bowie. Free; donations accepted. 301-390-1020 or www.radiohistory.org.
OUTDOOR JAZZ, performances by the George Oakley Quartet, Cliff Art and the Alex Martin Experience. Seating limited to 60 people; lawn chairs welcome. Sponsored by the New Deal Cafe and the Friends of New Deal Cafe. 6:45-10 p.m., Roosevelt Center, 113 Centerway, Greenbelt. Free admission; refreshments sold. 301-474-5642.
BOWIE FARMERS MARKET, vegetables, fruits, flowers and baked goods. 8 a.m.-noon, Gallant Fox Lane and Route 197, Bowie. Free. 301-809-3076.
HISTORY TOUR AND TALK, park ranger Don Steiner discusses the British Invasion of 1814 and what caused the fall of the first Fort Washington. 2 p.m., Fort Washington Park, Visitor Center, 13551 Fort Washington Rd. Free. 301-763-4600.
HYATTSVILLE FARMERS MARKET, seasonal fruits and vegetables. 2-6 p.m., Queens Chapel Town Center, rear parking lot, Queens Chapel Road and Hamilton Street, Hyattsville. Free. 301-627-0977.
BELTSVILLE STORY TIME, for ages 3-5. 10:30 a.m., Beltsville Library, 4319 Sellman Rd., Beltsville. Free. 301-937-0294.
LARGO STORY TIME, for ages 3-5. 11 a.m., Largo-Kettering Library, 9601 Capital Lane, Largo. Free. 301-336-4044.
SENIOR CENTER BID WHIST, for ages 55 and older. 12:30-3 p.m., Camp Springs Senior Center, 6420 Allentown Rd., Camp Springs. Free. 301-449-0490.
LAUREL BIRD WALK, for ages 16 and older, a guided tour to identify birds in several refuge habitats; binoculars and field guides recommended. 8-10 a.m., National Wildlife Visitor Center, Powder Mill Road, between Baltimore-Washington Parkway and Route 197, Laurel. Free; registration required. 301-497-5887.
RIVERDALE AREA FARMERS MARKET, includes watermelons, peaches, berries, vegetables, flowers, baked goods, eggs, jams, baskets and honey. 3-7 p.m., Riverdale Park Town Center, Queensbury Road and Rhode Island Avenue, Riverdale Park. 301-927-6381.
-- Compiled by LISA MARTIN
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