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.
HOWARD COUNTY FAIR -- Friday and Saturday 8 a.m. to 11 p.m. Agricultural exhibits, concerts, food vendors, amusement rides and games. $4, seniors $2, under age 10 free. Howard County Fairground, 2210 Fairground Rd., West Friendship. 410-442-1022.
POND AND WATER GARDEN EXPO -- Friday 3 to 9, Saturday 10 to 7, Sunday 10 to 5. Displays by vendors of koi fish and water gardening goods and services. $7. Sponsored by the Mid-Atlantic Koi Club a Dulles Expo Center, Willard Road off Route 28, Chantilly. 703-378-0910.
"CIVIL WAR ON THE HOMEFRONT" -- Saturday 10 to 4, living history portrayals of domestic life at the mansion by the Atlantic Guard Soldiers Aid Society. Belair Mansion, 12207 Tulip Grove Dr., Bowie. 301-809-3089.
BATTLE OF BLADENSBURG -- Saturday noon to 4, living history portrayals of British and American troops in the War of 1812, with drills, exhibits and children's activities. Author Anthony Pitch discusses his book, "The Burning of Washington." Admission to grounds free. House tours $3, seniors $2, students $1, under age 5 free. Riversdale House Museum, 4811 Riverdale Rd., Riverdale Park. 301-864-0420.
"STARLIGHT CINEMA" -- Saturdays at 7:30 through August, free outdoor screenngs of feature films. Saturday: "E.T." Watch from car or sit outside. Trinity Building parking lot, 5875 Trinity Pkwy., Centreville. 703-324-7469.
BENEFIT GOSPEL CELEBRATION -- Monday at 7, with cast members of "The Lion King," local college and church choirs and community dance troupes. $45, seniors $30, students and children $20. Proceeds benefit historically black colleges and Broadway Cares/Equity Fights AIDS. James Weldon Johnson Auditorium, Coppin State University, 2500 W. North Ave., Baltimore. 410-951-3400 or 410-951-3932.
"SCREEN ON THE GREEN" -- Monday at dusk, "The Big Sleep," 1946 feature film, shown on an outdoor screen. Free. On the Mall between Fourth and Seventh streets. 877-262-5866.
"SUNSET PARADE" -- Tuesday at 7. 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.
ARLINGTON COUNTY FAIR -- Thursday 5 to 10 outdoors, and 7 to 10 indoors, and Aug. 19-21. Exhibits, rides, games, entertainment, vendor displays. Free. Thomas Jefferson Community Center, 3501 S. Second St., Arlington. 703-920-4556.