PARKINSON'S DISEASE SUPPORT GROUP, 7-8 p.m. the fourth Thursday of each month. Riverdale Presbyterian Church, 6513 Queens Chapel Rd., University Park. Free. 301-864-5298.
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-Thursdays. Available through the Prince George's County Memorial Library System's Web site, www.pgcmls.info.
FOOD BAZAAR AND AUCTION, "A Chocolate Affair," for ages 18 and older, food and chocolate desserts from area bakers and restaurants, with a silent and live auction, to benefit the Maryland Crime Victims' Resource Center. 6:30-9:30 p.m., Mount Airy Mansion, 8714 Rosaryville Rd., Upper Marlboro. $40; reservations required. 301-952-0063.
GREENBELT BASKET BINGO, with door prizes and raffles, sponsored by the Greenbelt Labor Day Festival Committee. Refreshments will be sold. 7 p.m., American Legion, Greenbelt Post 136, 6900 Greenbelt Rd., Greenbelt. $20; advance, $17. 301-910-0050 or 301-982-2312.
FIREHOUSE CELEBRATION, a parade, firefighters competing in fire hose competitions, a bone-marrow drive, a flea market, refreshments for sale and vendors, sponsored by the Brandywine VFD Company 40. 9 a.m.-3 p.m., at the firehouse, 14201 Brandywine Rd., Brandywine. 301-883-7740 or www.BrandywineVFD.com.
FUN WITH HISTORY, for children ages 9-12 accompanied by an adult, 18th- and 19th-century games and interactive activities; kids will make a toy to take home. 10 a.m.-noon, Montpelier Mansion, Route 197 and Muirkirk Road, Laurel. $5; reservations required. 301-953-1376.
BOWIE FITNESS FAIR, for all ages; children 6 and younger must be accompanied by an adult. Health screenings, weight training, aerobics and more. 10 a.m.-1 p.m., Huntington Community Center, 13022 Eighth St., Bowie. Free. 301-464-3725.
CLINTON NATURE FAIR, animal shows, nature hikes, crafts, face-painting, games, music, refreshments, vendors and a visit from the Washington Nationals mascot Screech. Also, a show presented by Blue Sky Puppet Theater. 10 a.m.-2 p.m., Clearwater Nature Center, 11000 Thrift Rd., Clinton. Admission, free; puppet show, $2 plus required registration. 301-297-4575.
AUTHOR APPEARANCE, Rosemary E. Reed-Miller presents her book, "Threads of Time, the Fabric of History," about black women who created garments for historical figures, including first ladies Mary Todd Lincoln and Jacqueline Kennedy. 1 p.m., New Carrollton Library, 7414 Riverdale Rd., New Carrollton. Free. 301-459-6900.
INTERNATIONAL STREET FEST, ethnic foods for sale, rides, clowns, a moon bounce, face-painting, fireworks and a performance by Just Us band. Also, information booths staffed by representatives from the Hyattsville Police Department and the Prince George's County Fire Department. 4-8 p.m., Queens Chapel Town Center, 31st Avenue and Hamilton Street. Free. 301-985-5000 or www.hyattsville.org.
HEALTH FAIR, screenings, information and counseling by health professionals of the University of Maryland School of Nursing, Adventist Health Care and others; sponsored by Action Langley Park. 1-4 p.m., Langley Park Community Center, 1500 Merrimac Dr., Langley Park. Free. 301-405-4005.
HISTORIC WALKING TOUR, local historian Joe Robison leads a walk down Main Street with a discussion of previous and current uses of several buildings, sites of buildings that no longer exist, and architectural styles spanning the past 150 years. Sponsored by the Laurel Historical Society. 2 p.m., meet at the Laurel Museum, 817 Main St., Laurel. Free. 301-725-7975.
SCRABBLE GROUP, for all experience levels. 6-8 p.m., Coffee and Conversations cafe, 12754 Old Fort Rd., Fort Washington. Free. 301-868-6360.
CHESS CLUB, for all ages and skill levels, with instructor Paul Yates. 6:30 p.m., Hillcrest Heights Library, 2398 Iverson St., Temple Hills. Free. 301-630-4900.
INTERNET SKILLS CLASS, for ages 18 and older, how to navigate the Internet. 6:30-8:30 p.m. Monday and Wednesday, Prince George's Sports & Learning Complex, 8001 Sheriff Rd., Landover. $30; nonresidents of Prince George's and Montgomery counties, $36. Registration required. 301-583-2430 or www.pgsportsandlearn.com.
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.
SCRAPBOOK CLASS, for beginners 18 and older. 6:30-8 p.m. Tuesdays, through Nov. 15, Huntington Community Center, 13022 Eighth St., Bowie. $45; nonresidents of Prince George's and Montgomery counties, $54. Registration required. 301-464-3725.
CLINTON FRIENDS OF THE LIBRARY, meeting to discuss fundraising, volunteering and special projects. 7:30 p.m., Surratts-Clinton Library, 9400 Piscataway Rd., Clinton. Free. 301-868-9200.
SENIOR CENTER LINE DANCING, for ages 60 and older. 10 a.m.-noon, Langley Park Senior Center, 1500 Merrimac Dr., Langley Park. Free. 301-408-4343.
LARGO EVENING STORY TIME, for ages 3-5; bring a teddy bear or another stuffed animal. 7 p.m., Largo-Kettering Library, 9601 Capital Lane, Largo. Free. 301-336-4044.
GLENARDEN STORY TIME, for ages 2-5. 10:30 a.m., Glenarden Library, 8724 Glenarden Pkwy., Glenarden. Free. 301-772-5477.
SENIOR CENTER BID WHIST, weekly games for those 55 and older. 12:30-3 p.m., Camp Springs Senior Center, 6420 Allentown Rd., Camp Springs. Free. 301-449-0490.
-- Compiled by LISA MARTIN
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