A MR. DERBY JAM SESSION -- Tuesday-Friday at 10:30 a.m. Ages 4-7. Derick Riley teaches nursery tunes through song and dance. Tuesday: Petworth Neighborhood Library, 4200 Kansas Ave. NW, 202-541-6300; Wednesday: Lamond-Riggs Neighborhood Library, 5401 South Dakota Ave. NE, 202-541-6255; Thursday: Georgetown Neighborhood Library, 3260 R St. NW, 202-282-0220; Friday: Deanwood Kiosk, 4215 Nannie Helen Burroughs Ave. NE, 202-724-8526. All free.

THE THREE LITTLE PIGS -- Wednesday at 10:30 a.m. A reading of the classic fable. American Institute of Architects, Octagon Building courtyard, 1735 New York Ave. NW. Free. 202-626-7541.

OLD-FASHIONED COOKING CLASS -- Wednesday at 1 p.m. Ages 8 and older. Learn traditional cooking skills such as making bread, grinding corn and churning butter. Cherry Hill Farmhouse, 312 Park Ave, Falls Church. $8. For reservations, call 703-248-5171.

WEST AFRICAN DANCE -- Wednesday-Thursday at 1:30 p.m. Ages 12 and older. Coyaba Dance Theatre presents an interactive workshop. Wednesday: Mount Pleasant Neighborhood Library, 3160 16th St. NW, 202-671-0200; Thursday: Martin Luther King Jr. Memorial Library, 901 G St. NW, 202-727-5535. Both free.

SPLISH SPLASH -- Saturday at 2 p.m. Wade in Turkeycock Run and create an aquatic habitat in a jar. Water-friendly footwear recommended. Green Spring Gardens Park, 4603 Green Spring Rd., Alexandria. $10. For reservations, call 703-642-5173.

WINGS OF FANCY -- Through Sept. 18. Live butterflies from Central and South America and Maryland in an indoor and outdoor exhibit. Brookside Gardens, 1800 Glenallan Ave., Wheaton. $4.50, ages 3-12 $3.50, 2 and younger free. 301-962-1400.