LAUREL BIRD WALK, for ages 16 and older; 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.
GLENARDEN STORY TIME, ages 2-5, limited to 35 children. 10:30 a.m., Glenarden Library, 8724 Glenarden Pkwy., Glenarden. Free. 301-772-5477.
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.
FITNESS CLASSES, low-impact exercises for people 55 and older. 11-11:45 a.m. Fridays, Tuesdays and Wednesdays, through Sept. 28, Camp Springs Senior Center, 6420 Allentown Rd., Camp Springs. $10; nonresidents of Prince George's and Montgomery counties, $12. Reservations required. 301-449-0490.
COLLEGE PARK FARMERS MARKET, fresh fruits and vegetables in an open-air 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. 301-277-3717.
GREENBELT PARK PLANT REMOVAL, volunteers will help remove invasive plants from the park; bring gloves, lunch and water. 11 a.m., Greenbelt National Park, Sweetgum picnic area, 6565 Greenbelt Rd., Greenbelt. Free. 301-344-3944.
NATURE-THEMED CRAFTS, for children ages 3-7 accompanied by an adult. 1-1:45 p.m., Bladensburg Waterfront Park, 4601 Annapolis Rd., Bladensburg. $2; nonresidents of Prince George's and Montgomery counties, $3. Reservations required. 301-779-0371.
VINTAGE TELEVISION, episodes of "The Howdy Doody Show" from 1948 and "Bonnie Maid Versa-Tile Varieties" from 1949; plus, ongoing exhibitions of broadcast artifacts and vintage radios and television sets. 1-4 p.m. Saturday and Sunday, Radio and Television Museum, 2608 Mitchellville Rd., Bowie. Free; donations accepted. 301-390-1020 or www.radiohistory.org.
LANGLEY PARK BRIDGE GAMES, for people 60 and older. 9 a.m.-2 p.m., Langley Park Senior Center, 1500 Merrimac Dr. Free. 301-408-4343.
OXON HILL STORY TIME, for ages 2-3. 10:30 a.m. and 11:15 a.m., Oxon Hill Library, 6200 Oxon Hill Rd., Oxon Hill. 301-839-2400.
FARMERS MARKET, seasonal fruits and vegetables. 2-6 p.m., Queens Chapel Town Center, rear parking lot, Queens Chapel Road and Hamilton Street, Hyattsville. 301-627-0977.
AEROBICS CLASSES, for people 55 and older. 6-7 p.m. Tuesdays and Thursdays, through Sept. 29, Lake Arbor Community Center, 10100 Lake Arbor Way, Mitchellville. $30; nonresidents of Prince George's and Montgomery counties, $36. Registration required. 301-333-6561.
LANDOVER COMPUTER CLASSES, for ages 18 and older, finger placement, typing speed and accuracy. 7-9 p.m. Tuesdays, through Oct. 25, Prince George's Sports & Learning Complex, 8001 Sheriff Rd., Landover. $80; nonresidents of Prince George's and Montgomery counties, $96. Reservations required. 301-583-2400 or www.pgsportsandlearn.com.
SENIOR CENTER LINE DANCING, for people 60 and older. 10 a.m.-noon, Langley Park Senior Center, 1500 Merrimac Dr., Langley Park. Free. 301-408-4343.
FAIRMOUNT HEIGHTS CHESS CLUB, for all ages, with instructor Ted Fagan. 5 p.m., Fairmount Heights Library, 5904 Kolb St., Fairmount Heights. Free. 301-883-2650.
GENEALOGY TALK, genealogist Chuck Mason, discusses "Beyond the Census: Using Census Information," sponsored by the Prince George's County Genealogical Society. 7-9 p.m., Greenbelt Library, 11 Crescent Rd., Greenbelt. 301-262-2063.
COMPUTER CLASSES, for people 60 and older, finger placement, typing speed and accuracy. 10-11 a.m. Thursdays, through Sept. 29, Beltsville Community Center, 3900 Sellman Rd., Beltsville. $30; nonresidents of Prince George's and Montgomery counties, $36. Registration required. 301-937-6613.
RIVERDALE AREA FARMERS MARKET, watermelons, berries, peaches and other fruits, 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.
LIBRARY BOARD MEETING, the Prince George's County Memorial Library System Board of Library Trustees. 8 p.m., Administrative Offices, 6532 Adelphi Rd., Hyattsville. Free. 301-699-3500.
-- Compiled by LISA MARTIN
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