LIVE BUTTERFLY SHOW -- Open daily from 10 to 4, through Sept. 18. Butterflies fly freely in an indoor garden of nectar plants. $4.50, ages 3 to 12 $3.50. Brookside Gardens, 1800 Glenallan Ave., Wheaton. 301-962-1400.
WASHINGTON COUNTY Agricultural Expo, Friday 3 to 9, Saturday through July 29 9 a.m. to 10 p.m. Agricultural and home arts exhibits, tractor pull, antique car show, games, entertainment. Washington County Agricultural Education Center, Route 65, Sharpsburg. 301-791-1404 or 301-432-6854.
"MOVIES UNDER THE MOON" -- Free feature films at dusk on an outdoor screen: "Ghostbusters," Friday; and "Dirty Dancing," Saturday. Gates and vendor booths open at 6:30. Proceeds from food sales benefit Inova Fairfax Hospital for Children and Special Love for children with cancer. George Mason University, 4400 University Dr., Fairfax. 703-323-6333.
STUDIO THEATER GARAGE SALE -- Saturday 10 to 4. Display and sale of costumes, furniture, set pieces, posters, books and other goods used in plays during the 2004-2005 season. Studio Theatre, 1501 14th St. NW. 202-332-3300.
CIVIL WAR ENCAMPMENT -- Saturday 10 to 5, Sunday 10 to 4. Drills, demonstrations, living history portrayals, skirmishes. $6, seniors and children $4. Sully Historic Site, 3601 Sully Rd., Chantilly. 703-437-1794.
INTERNATIONAL PAPER MODELERS Convention, Saturday 10 to 6. Displays and sales of model airplanes, ships, birds, castles and other objects made from paper. Days Hotel at Dulles, 2200 Centreville Rd., Herndon. 703-620-9720.
NFL ALUMNI FLAG FOOTBALL -- Sunday at 3, former members of the Washington Redskins and Philadelphia Eagles meet in a flag football game; festival starts at noon, with children's activities and silent auction. $20. A benefit for several charities. Prince George's Sports and Learning Center, 8001 Sheriff Rd., Landover. 202-397-7328.
"SCREEN ON THE GREEN" -- Free feature films screened Mondays at dusk through Aug. 15 on an outdoor screen: "The Treasure of the Sierra Madre," Monday. On the Mall between Fourth and Seventh streets. 877-262-5866.
"SUNSET PARADE" -- Tuesdays at 7, through Aug. 16. The Marine Drum & Bugle Corps, Silent Drill Team and marching units stage a colorful full-dress parade at the U.S. Marine Corps War Memorial (Iwo Jima Memorial), on U.S. 50 adjacent to Arlington National Cemetery. 202-433-6060.
"AN EVENING IN ULAAN Baatar" -- Wednesday at 4, buffet, entertainment and silent auction. $14.99, to benefit Kunzang Palyul Choling's Mongolian Project. Mongolian Barbecue, 7201 Wisconsin Ave., Bethesda. 301-349-0440.
"TWILIGHT TATTOO" -- Wednesday at 7. A military pageant and drills by the U.S. Army Third Infantry, Fife & Drum Corps, Drill Team and Army Band musicians. On the Ellipse, south of the White House. Free. 202-685-4989.
"ARTRAIN USA" -- Thursday noon to 7, and through July 31. Exhibition of "Native Views: Influences of Modern Culture," 71 artworks by 54 Native American artists in three traveling railroad cars. Adjacent to City Hall at Main and Center streets Manassas. 800-278-1971.