"WINGS OF FANCY" -- Watch live butterflies fly freely in a colorful garden. Open daily 10 to 4, through Sept. 19. $4, ages 3 to 12 $3. No strollers permitted. Brookside Gardens, 1800 Glenallan Ave., Wheaton. 301-962-1400.
U.S. MARINE CORPS "EVENING Parade" -- Fridays at 8:45 through Aug. 27, the Marine Band, Drum & Bugle Corps, Silent Drill Platoon and marching units stage a colorful full-dress parade. Free, but reservations are required and must be requested in writing. At the Marine Barracks, Eighth and I streets SE. For mailing instructions, call 202-433-6060.
RUMMAGE SALE -- Saturday 7 to 1, to benefit the Alexandria Junior Chamber of Commerce. At the Birchmere parking lot, 3701 Mount Vernon Ave., Alexandria. 703-866-7171.
HOWARD COUNTY FAIR -- Friday and Saturday; grounds open from 8 a.m. to 11 p.m.; rides and games open Friday at 1, Saturday at 11. Livestock displays, horse and tractor pulls, antique car show, exhibits, amusement rides and games, entertainment $4, seniors $2, under age 10 free. Howard County Fairgrounds, 2210 Fairgrounds Rd., West Friendship. 410-442-1022.
OLD DOMINION DRAFT HORSE, Mule, Donkey and Pony Show, Saturday beginning at 9 a.m. Competitions and demonstrations in harness, saddle and walking categories. $5, seniors and ages 6 to 15 $3. Warrenton Horse Show grounds, 60 E. Shirley Ave., Warrenton. 703-753-3291.
BEGONIA PLANT SHOW -- Saturday 9 to 4, Sunday noon to 4, by the Potomac Branch of the American Begonia Society. Green Spring Gardens Park, 4601 Green Spring Rd., Annandale. 703-642-5174.
"GAY DAY" AT HILLWOOD -- Saturday 10 to 8. Tour the former estate of heiress Marjorie Merriweather Post, with entertainment by the Rock Creek Singers, lectures on fashion and gardening, and a portrayal of Madame Pompadour. $15, ages 18 and younger $5. Reservations required. Hillwood, 4155 Linnean Ave. NW. 202-686-5807.
CAMBODIAN COMMUNITY Festival -- Saturday 11 to 6. Traditional entertainment, crafts, foods. Ben Brenman Park, 5000 Duke St., Alexandria. 703-883-4686.
BENEFIT CHILI COOK-OFF -- Saturday noon to 6, for First Night Alexandria. About a dozen chili chefs compete to enter a national competition in October. Admission free, donations encouraged. Hard Times Cafe parking lot, 1404 King St., Alexandria. 703-626-1266.
"SCION THRASH & JAM TOUR" -- Saturday and Sunday from 2 to 8. Skateboarding demonstrations and competitions by Bucky Lasek, Pierre Luc Gagnon and others; music by Jimmie's Chicken Shack, the Kelly Bell Band and others. Admission free; parking $10. Bowie Baysox Stadium, 4101 Crain Hwy., Bowie. 410-605-9381.
COMMUNITY FESTIVAL -- Saturday 4 to 9. Entertainment, classic cars, crafts fair, children's activities, food vendors. Leonardtown Square, Washington Street, Leonardtown. 301-475-9791.
"SCREEN ON THE GREEN" -- Monday at dusk, Frank Capra's 1939 film "Mr. Smith Goes to Washington," starring James Stewart, will be shown on a large outdoor screen. Free. On the Mall between Fourth and Seventh streets NW. 877-262-5866.
U.S. MARINE CORPS "SUNSET Parade" -- Tuesday at 6:30, the Marine Drum & Bugle Corps, Silent Drill Team and marching units stage a colorful full-dress parade. Free. At the Marine Corps War Memorial (Iwo Jima Memorial), on U.S. 50 next to Arlington National Cemetery. 202-433-6060.
ARLINGTON COUNTY FAIR -- Open Thursday outdoors from 5 to 10, indoors 7 to 10, and continuing through Aug. 22. Exhibits, rides, games, food vendors. Thomas Jefferson Community Center, 3501 S. Second St., Arlington. 703-920-4556 (TDD: 703-228-4743.)