MARYLAND STATE FAIR -- Open Friday through Monday. Livestock and horse shows begin at 9, and exhibit halls open at 10. Midway rides and games open Friday at noon, other days at 10 a.m. $6, younger than 12 free; rides priced individually. Maryland State Fairgrounds, 2200 York Rd., Timonium. 410-252-0200.
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.
GREENBELT LABOR DAY FESTIVAL -- Friday 6 to midnight, Saturday and Sunday 8 to midnight, Monday 8 to 6. Entertainment, carnival rides and games, food vendors, crafts fair. Concerts by Herman's Hermits, Sunday at 1, and Shoe Suede Blues With Peter Tork, Monday at noon. Outdoors at Crescent Road and Southway, Greenbelt. 301-910-0050.
"A TRIBUTE TO WORLD WAR II Veterans" -- Friday at 7, with remarks by officials, entertainment by the Navy Band and Air Force Airmen of Note, followed by fireworks. At the World War II Memorial, 17th Street between Constitution and Independence avenues. 703-696-0120.
FLEA MARKET -- Saturday 9 to 3. Nativity Catholic Church, 6008 Georgia Ave. NW. 202-726-6262.
ART FAIR -- Saturday 9 to 7, Sunday 1 to 4, Monday 10 to 2, by the St. Michael's Art League. St. Luke's Methodist Church, 304 S. Talbot St., St. Michaels, Md. 410-745-0221.
MARYLAND RENAISSANCE Festival -- Open Saturday, Sunday and Monday from 10 to 7, and weekends through Oct. 23. A replica of a 16th-century English village, with singers, musicians, jugglers, magicians and other performers on 10 stages; displays by more than 140 artisans; jousting tournaments; and food vendors. $17, seniors $15, ages 7 to 15 $8 (younger free). On Crownsville Road off Route 450, Crownsville. 800-296-7304 or 410-266-7304.
MIDDLE EASTERN FOOD FESTIVAL -- Saturday 11 to 11, Sunday noon to 7. Traditional foods and desserts, children's activities, folk dancing. Holy Transfiguration Melkite Greek-Catholic Curch, 8501 Lewinsville Rd., McLean. 703-200-6416 or 703-734-9566.
CLASSIC CAR SHOW -- Sunday 10 to 3; award ceremony at 3. $3, younger than 12 free. A benefit for muscular dystrophy charities. Northern Virginia Community College, 1000 Harry Flood Byrd Hwy., Sterling. 703-430-9188 or 703-444-2343.
LABOR DAY PARADE AND FESTIVAL -- Monday at 10, from Plyers Mill Road and St. Paul Street along Connecticut Avenue to Howard Avenue in Kensington, followed by a street festival until 3 with music, food, crafts, children's activities. 301-942-8784.