FAIRFAX FLOWER SHOW, sponsored by the Dominion Valley Garden Club, 1:30-6 p.m. today, 10 a.m.-2 p.m. Friday, Merrifield Garden Center, 12101 Lee Hwy., Fairfax. Free. 703-323-7999.
HISTORY OF THE U.S. FLAG, author Marc Leepson discusses his book "Flag: An American Biography," a meeting of the Vietnam Veterans of America, 7:30 p.m., Neighbor's Restaurant, Cedar Lane Shopping Center, 262D Cedar Lane, Vienna. Free. 703-255-0353.
JUNIOR BROWN CONCERT, country rock and blues guitar, 8 p.m., the Barns at Wolf Trap, 1635 Trap Rd., Vienna. $24. Tickets, 703-218-6500; information, 703-255-1860.
"UNCLE VANYA," an Anton Chekhov play performed by the George Mason University Players, 8 p.m. today, Friday and Oct. 27 and 29, 2 and 8 p.m. Saturday and Oct. 28, 2 p.m. Sunday and Oct. 30, George Mason University, Harris Theater, Fairfax. $10; students and seniors, $7. 888-945-2468.
CHANTILLY USED-BOOK SALE, 10 a.m.-5 p.m. Friday and Saturday, noon-3 p.m. Sunday, Chantilly Regional Library, 4000 Stringfellow Rd. Free. 703-502-3883.
MILITARY MIA/POW TALK, Adrian Cronauer of the Department of Defense discusses research of U.S. military personnel missing in action or prisoners of war in post-World War II conflicts, 10 a.m., Falls Church Community Center, 223 Little Falls St., Falls Church. Free. 703-243-2035.
SIXTH-GRADERS HALLOWEEN PARTY, food, games and a costume contest, 3:30-6 p.m., Club Phoenix Teen Center, Vienna Community Center, 120 Cherry St. SE, Vienna. Free. 703-255-6360.
VIENNA HALLOWEEN MOVIE, for children and adults, outdoor screening of a PG-rated movie, bring lawn chairs or blankets, sundown, Glyndon Park, 300 Glyndon St. NE, Vienna. Free. 703-255-7842.
VIENNA BLUEGRASS CONCERT, gospel-flavored bluegrass by Doyle Lawson and Quicksilver, 8 p.m., the Barns at Wolf Trap, 1635 Trap Rd., Vienna. $22. Tickets, 703-218-6500; information, 703-255-1860.
VICTORIAN GHOST STORIES, read by the Victorian Society of Falls Church, 8 p.m., Cherry Hill Farmhouse, 312 Park Ave., Falls Church. $4; reservations required. 703-248-5171.
MOUNT VERNON HARVEST DAYS, for all ages, musicians performing 18th-century works, candle making, blacksmithing, children's activities, costumed field workers, open-fire cooking and more, 9 a.m.-5 p.m. Saturday and Sunday, Mount Vernon Estate and Gardens, 3200 George Washington Memorial Pkwy. $11; seniors, $10.50; ages 6-11, $5; 5 and younger, free. 703-780-2000.
GREAT FALLS NATURE WALK, sponsored by the Nature Conservancy, 9 a.m.-noon, the conservancy's Fraser Preserve, 101 Springvale Rd., Great Falls. Free. 703-262-0646.
FALLS CHURCH FESTIVAL, food, crafts, games, fire department safety demonstrations, police dog demonstrations, a moon bounce, face painting, pumpkin painting, a Red Cross disaster preparedness workshop and more, sponsored by the Greater Merrifield Business Association, 9:30 a.m.-4:30 p.m., Luther Jackson Middle School, 3020 Gallows Rd., Falls Church. Free. 703-790-9400.
OAKTON CHILDREN'S FAIR, games, pony rides, a moon bounce, crafts, a costume parade and food, proceeds to benefit victims of Hurricane Katrina, 10 a.m.-2 p.m., Montessori School of Oakton, 12113 Vale Rd. Free admission; small fee for activities. 703-851-3039.
MCLEAN "BOO FEST," a Halloween-theme event with pumpkin decorating, face painting, pony rides, a clown, a moon bounce, tours of the Claude Moore Colonial Farm, a costume contest with prizes, a picnic lunch and more, to benefit Angels of Mercy, a charity benefiting military personnel returning from active duty, sponsored by the Greater McLean Chamber of Commerce, 10 a.m.-2 p.m., Claude Moore farm, Pavilions of Turkey Run, 6210 Georgetown Pike. $5 (includes lunch); children 2 and younger and families with military ID, free. 703-356-5424.
MCLEAN PUPPET SHOW, "Aesop's Fables," performed by puppeteer Jim West and his large-scale puppets, 11 a.m. and 1:30 p.m., Alden Theatre, McLean Community Center, 1234 Ingleside Ave. $9; McLean residents, $7. 703-573-7328.
VIENNA HALLOWEEN PARTY, for ages 4-12, carnival games, prizes and more, participants are encouraged to wear costumes, co-sponsored by the Vienna Parks and Recreation Department, 2-3:30 p.m., Vienna Community Center, 120 Cherry St. SE. Free. 703-255-6360.
FAIRFAX CHRYSANTHEMUM SHOW, sponsored by the Old Dominion Chrysanthemum Society in celebration of its 40th anniversary, 2-5 p.m. Saturday, 10 a.m.-3 p.m. Sunday, Merrifield Garden Center, 12101 Lee Hwy., Fairfax. Free. 703-560-8776.
ANNANDALE CONCERT, DESSERTS, music by the youth choruses of the Fairfax Choral Society, followed by a dessert tasting, 7 p.m., Annandale United Methodist Church, 6935 Columbia Pike. $10. 703-642-3277.
MUNICH SYMPHONY CONCERT, 8 p.m.; discussion, 7:15 p.m., George Mason University, Center for the Arts, Concert Hall, Fairfax. $50, $42, $25. 888-945-2468.
VIENNA CHORAL SOCIETY, concert of spirituals and other songs of the American South, 7:30 p.m., Church of the Holy Comforter, 543 Beulah Rd. NE, Vienna. $15; seniors and students, $12. 703-255-5508.
CITY OF FAIRFAX BAND, concert, "A Salute to Hollywood and Broadway," 8 p.m., Fairfax High School, auditorium, 3500 Old Lee Hwy., Fairfax City. $10; seniors and students, $5. 703-757-0220.
ONE-ROOM SCHOOL OPEN HOUSE, information on how elementary school students were taught in the historic Laurel Grove School, sponsored by Laurel Grove School Association and Fairfax County Retired Educators, 1-4 p.m., at the school, 6840 Beulah St., Franconia. Free. 703-502-0941.
ALEXANDRIA ORGAN CONCERT, works by Buxtehude, Bach and Reger performed by organist Jeffrey R. Pannebaker, 4 p.m., Nativity Lutheran Church, 1300 Collingwood Rd., Alexandria. Donations requested. 703-768-1112.
FALLS CHURCH CLASSICAL CONCERT, the Marquis Trio performs works by Debussy, Saint-Saens and Chausson, 4 p.m., St. Patrick's Episcopal Church, 3241 Brush Dr., Falls Church. Free. 703-533-9454.
ENGLISH CLASSICAL CONCERT, Washington Metropolitan Philharmonic presents "Music of England," 5 p.m., Bishop Ireton High School, 201 Cambridge Rd., Alexandria. $10; 18 and younger, free. 703-751-7606.
ALEXANDRIA CHORAL CONCERT, West Potomac High School's a cappella Colonial Singers and Soundsations, 5 p.m., Heritage Presbyterian Church, 8503 Fort Hunt Rd., Alexandria. Free. 703-360-9546.
BROADWAY TRIBUTE, concert by Marvin Hamlisch, 7 p.m.; discussion, 6:15 p.m., George Mason University, Center for the Arts, Concert Hall, Fairfax. $40, $32, $20; 12 and younger, half-price. 888-945-2468.
SPRINGFIELD CHORAL CONCERT, Navy Sea Chanters, 7 p.m., St. John's United Methodist Church, 5312 Backlick Rd., Springfield. Free. 202-433-2525.
VIENNA SQUARE DANCE CLASS, with caller Mac McCoy, moderate exercise, 11 a.m.-1 p.m. Monday and Oct. 31, Vienna Community Center, 120 Cherry St. SE. $25, includes both sessions; Vienna residents, $20. 703-255-6360.
STATE CANDIDATES TALK, Del. Kenneth R. Plum (D), incumbent candidate for the Virginia House of Delegates District 36, and C. Chuck Caputo (D), House of Delegates candidate in District 67, discuss the state income tax, health care and prescription drug costs, real estate taxes and legislation governing nursing homes and assisted living facilities, sponsored by the National Active and Retired Federal Employees Association, 11:30 a.m., Amphora Deluxe Diner, 1151 Elden St., Herndon. $13.50, includes lunch; reservations required by Oct. 20. 703-966-1122.
VIENNA WOMEN'S SAFETY CLASS, on self-defense techniques and avoiding risky situations, led by Vienna police officer Virginia Palmore, four-part class: 7-10 p.m. Monday and Oct. 27, Nov. 7 and 9, Vienna Community Center, 120 Cherry St. SE. $22.50; Vienna residents, $20. 703-255-6360.
FAIRFAX PIANO RECITAL, by Sonya Sunhee Kim, a George Mason University faculty member, 8 p.m., the university's Center for the Arts, Concert Hall, Fairfax. Free. 703-993-2787.
HERNDON TOWN COUNCIL MEETING, 7:30 p.m., Herndon Council Chambers, 765 Lynn St. 703-435-6804.
MCLEAN ANTIQUES APPRAISAL CLASS, by antiques and decorative arts appraiser Francine Proulx, 7:30-9 p.m., McLean Community Center, 1234 Ingleside Ave. $35; McLean residents, $30; advance registration required. 703-790-0123.
HERNDON ENGLISH COUNTRY DANCING, no partner necessary, all dances taught by leader Barbara Harding, with flutist Colleen Reed, 7:45 p.m., Harding Hall, 730 Jackson St., Herndon. $3. 703-437-3615.
GMU CONCERT, George Mason University Symphony Orchestra, 8 p.m., the university's Center for the Arts, Concert Hall, Fairfax. $7; students and seniors, $5. 888-945-2468.
RESTON HALLOWEEN TRAIL, for 5 and younger, a 45-minute guided walk through a forest, with jack-o-lanterns, popcorn, cartoons (snacks and hot cider for sale), 6-8 p.m., Walker Nature Education Center, 11450 Glade Dr., Reston. $5. 703-435-6530.
VIENNA HALLOWEEN PARADE, marching bands and floats; parade route is on Maple Avenue, from Branch Road to Center Street, 7 p.m.; children wearing costumes accompanied by an adult are invited to walk in the parade, meet in the parking lot of Virginia Commerce Bank, 6:30 p.m., 374 Maple Ave. E. Free. 703-255-6360.
ANNANDALE MASQUERADE POPS CONCERT, Annandale and Fairfax high school orchestra musicians wearing Halloween costumes perform pops and spooky music, 7:30 p.m., Annandale High School, auditorium, 4700 Medford Dr. Free. 703-642-4300.
RESTON HALLOWEEN TRAIL, for 5 and older, a 45-minute guided walk through a forest, with jack-o-lanterns, popcorn, cartoons (snacks and hot cider for sale), 6:30-9 p.m. Oct. 27 and 28, Walker Nature Education Center, 11450 Glade Dr., Reston. $5. 703-435-6530.
"CITIZEN DIPLOMACY" LECTURE, discussion of the role of individuals in public diplomacy, by Sherry Mueller, president of the National Council for International Visitors, sponsored by the Mount Vernon Branch of the American Association of University Women, 7 p.m., Sherwood Hall Library, 2501 Sherwood Hall Lane, Alexandria. Free. 703-768-8996.
WOLF TRAP CONCERT, pop, folk and jazz by David Wilcox, 8 p.m. Oct. 27 and 28, the Barns at Wolf Trap, 1635 Trap Rd., Vienna. $22. Tickets, 703-218-6500; information, 703-255-1860.
MCLEAN CARIBBEAN CONCERT, "Masters of Caribbean Music" show, with performers specializing in different forms of Caribbean music, 8 p.m., Alden Theatre, McLean Community Center, 1234 Ingleside Ave. $26; McLean residents, $22; students; $18. 703-790-0123.
-- Compiled by JEAN MACK
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