GLENARDEN STORY TIME, for ages 2-5. 10:30 a.m., Glenarden Library, 8724 Glenarden Pkwy., Glenarden. Free; limited to the first 35 people. 301-772-5477.
HYATTSVILLE LIBRARY CHESS CLUB, for ages 13 and older, with instructor Ted Fagan; beginning and intermediate-level players welcome. 7 p.m., Hyattsville Library, 6532 Adelphi Rd., Hyattsville. Free. 301-985-4690.
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.
SNAKE HUNT, children 6 and older will learn about and search for non-venomous and venomous snakes. 10-11:30 a.m., Clearwater Nature Center, 11000 Thrift Rd., Clinton. $2; nonresidents of Prince George's and Montgomery counties, $3. Registration required. 301-297-4575.
UPPER MARLBORO BOAT TOUR, for ages 6 and older, a sunset tour of the Patuxent River on a pontoon; refreshments. 6-8 p.m., Patuxent River Park, 16000 Croom Airport Rd., Upper Marlboro. $3; nonresidents of Prince George's and Montgomery counties, $4. Registration required. 301-627-6074.
BUTTERFLY HIKE, for ages 10 and older, a guided, 21/2-mile walk to learn about butterflies and their role in the ecosystem and to identify local species. Field guides recommended; participants should bring water and dress appropriately. 8:30-noon, Patuxent Research Refuge, North Tract, Route 198, between Baltimore-Washington Parkway and Route 32, Laurel. Free; reservations required. 301-497-5887.
UPPER MARLBORO BICYCLING, for ages 8 and older, a guided tour of park trails; bring a mountain bike and helmet. 9-11 a.m., Patuxent River Park, 16000 Croom Airport Rd., Upper Marlboro. $2; nonresidents of Prince George's and Montgomery counties, $3. Registration required. 301-627-6074.
USED BOOK SALE, 9 a.m.-5 p.m. Saturday and noon-5 p.m. Sunday, New Carrollton Library, 7414 Riverdale Rd.. New Carrollton. Admission, free. 301-459-6900.
HYATTSVILLE GARDENING TALK, how to attract butterflies to a garden.10 a.m., Hyattsville Library, 6530 Adelphi Rd., Hyattsville. Free. 301-985-4690.
TOOL MUSEUM, displays and demonstrations of 19th-century farm implements, household items and trade tools. 1-4 p.m. Saturdays and Sundays, Duvall Tool Museum, Patuxent River Park, 16000 Croom Airport Rd., Upper Marlboro. Free. 301-627-6074.
SENIOR EXERCISE, for ages 60 and older, use of a fitness center and a swimming pool. 8 a.m.-noon Mondays, Wednesdays and Fridays, Prince George's Sports & Learning Complex, 8001 Sheriff Rd., Landover. Free; nonresidents of Prince George's and Montgomery counties, $8. Pool only for nonresidents, $5. 301-583-2400.
LARGO BOOK DISCUSSION, Alisa Valdes-Rodriguez's novel "The Dirty Girls Social Club." 1:30 p.m., Largo-Kettering Library, 9601 Capital Lane, Largo. Free. 301-336-4044.
CLINTON ADOPTION WORKSHOP, representatives of Adoptions Together discuss the process for adopting a black child age 8 or older and available support services; adoptive parents must be residents of Maryland, Virginia or the District. 7-8:30 p.m., Surratts-Clinton Library, 9400 Piscataway Rd., Clinton. Free. 301-439-2900 or www.adoptionstogether.org.
LANGLEY PARK BRIDGE GAMES, for those 60 and older. 9 a.m.-2 p.m., Langley Park Senior Center, 1500 Merrimac Dr. Free. 301-408-4343.
BLACK HISTORY TALK, historian C.R. Gibbs discusses "Defeating the Enemy Within: A Workshop on the Psychology of Black Self-Oppression." 7 p.m., Spauldings Library, 5811 Old Silver Hill Rd., District Heights. Free. 301-817-3750.
LARGO CHESS CLASS, for all ages, with instructor Guy Charity. 7 p.m., Largo-Kettering Library, 9601 Capital Lane, Largo. Free. 301-336-4044.
LINE DANCING, for those 60 and older. 10 a.m.-noon, Langley Park Senior Center, 1500 Merrimac Dr., Langley Park. Free. 301-408-4343.
CHILDREN'S NATURE HIKE, for ages 8-10, a park ranger leads a walk to look for snakes, frogs, turtles and other creatures. 3:30-5 p.m., National Wildlife Visitor Center, Powder Mill Road, between the Baltimore-Washington Parkway and Route 197, Laurel. Free; registration required. 301-497-5887.
LAUREL EVENING STORY TIME, for ages 3-6, 7 p.m.; for ages 6-9, 7:30 p.m., Laurel Library, 507 Seventh St., Laurel. Free; limited to the first 35 people. 301-776-6790.
LARGO STORY TIME, for ages 3-5. 11 a.m., Largo-Kettering Library, 9601 Capital Lane, Largo. Free. 301-336-4044.
RIVERDALE PARK FARMERS MARKET, early crops, bedding plants, strawberries, flowers, baked goods, eggs, jams, baskets and honey. 3-7 p.m., Riverdale Park Town Center, Queensbury Road and Rhode Island Avenue, Riverdale. Free. 301-927-6381.
UPPER MARLBORO LINE-DANCING CLASS, for ages 18 and older. 7-8 p.m. Thursdays, through Aug. 8, Kettering/Largo Community Center, 431 Watkins Park Dr., Upper Marlboro. $40; nonresidents of Prince George's and Montgomery counties, $48. Registration required. 301-390-8390.
-- Compiled by LISA MARTIN
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