ANNANDALE USED-BOOK SALE, fiction, nonfiction, rare and unusual books, children's books, comic books, CDs, cassette tapes and videotapes, 5-9 p.m. today, 10 a.m.-6 p.m. Friday, 10 a.m.-5 p.m. Saturday, noon-5 p.m. Sunday, George Mason Regional Library, 7001 Little River Tpk., Annandale. Free admission. 703-256-3800.
RESTON USED-BOOK SALE, fiction, children's books, cookbooks, reference books, biographies, business books and more, 10 a.m.-5 p.m. Friday, 10 a.m.-4:30 p.m. Saturday, noon-3:30 p.m. Sunday, Reston Regional Library, 11925 Bowman Towne Center Dr. Free admission; hardcovers, $1.50; paperbacks, 50 cents-$1. 703-689-2700.
CHANTILLY MUSICAL COMEDY, the Westfield Theatre Boosters perform "Forever Plaid," to benefit Westfield Theatre scholarship for graduating seniors, 8 p.m. Friday and Saturday, 2 p.m. Sunday, Westfield, 4700 Stonecroft Blvd., Chantilly. $10. 703-448-6439.
MCLEAN FAIR, food, games, music, a quilt raffle and sale of crafts, baked goods, books, CDs, used clothing, jewelry and accessories, 9 a.m.-1 p.m., St. Thomas Episcopal Church, 8991 Brook Rd., McLean. Free admission. 703-442-0330.
VIENNA COPS AND KIDS RUN, a one-mile fun run for children 6-14 to promote good relations between police and youths, refreshments provided, children 6-8 must be accompanied by an adult, 10 a.m., Vienna Police Headquarters, 215 Center St. S. Free; preregistration required. 703-255-6360.
VIENNA GARDENING PROGRAM, horticulturist Laurie Short shows ornamental grasses, 10 a.m., Meadowlark Botanical Gardens, 9750 Meadowlark Gardens Ct., Vienna. Free; reservations required. 703-255-3631.
ALEXANDRIA GARDEN BULBS TALK, horticulturist Brenda Skarphol recommends varieties of bulbs, 10-11:30 a.m., Green Spring Gardens Park, 4603 Green Spring Rd. (3.5 miles east on Route 236 from Beltway Exit 6), Alexandria. $11; reservations required. 703-642-5173.
LORTON FAIR, the 60th Annual Pohick Fair, with games, crafts, food, music, apple butter making demonstration and more, 10 a.m.-4 p.m., Pohick Fairgrounds, 9301 Richmond Hwy., Lorton. Free admission. 703-339-6572.
GREAT FALLS COUNTRY FAIR, with quilts on display, a quilt raffle, food, games, a used-book sale, a plant booth, a silent auction and more, 10 a.m.-3 p.m., St. Francis Episcopal Church, 9220 Georgetown Pike, Great Falls. Free admission. 703-759-2082.
MCLEAN FESTIVAL, live entertainment, face painting, arts and crafts projects, games, a moon bounce, pony rides, food and more, 11 a.m.-4 p.m., McLean Community Center, 1234 Ingleside Ave. Adults, free; ages 2-10, $8 (McLean children 2-10, $6); 1 and younger, free. 703-790-0123.
DULLES FESTIVAL, teams of 20 people compete to pull a 747 aircraft the fastest; plus aircraft on display, a car show, live music, food, games and children's activities, sponsored by the Metropolitan Washington Airports Authority Police Department to raise money for Special Olympics Virginia, 11 a.m.-4 p.m., Washington Dulles International Airport, behind Cargo Building 5 (follow signs to parking and shuttle buses). Free. 703-359-4301.
GREAT FALLS SCARECROW WORKSHOP, how to make a scarecrow for your lawn or garden, participants should bring an outfit for a scarecrow and an old pair of pantyhose, stuffing provided, noon-2 p.m. Saturday, 1-3 p.m. Sunday, Colvin Run Mill, 10017 Colvin Run Rd., Great Falls. $5 per scarecrow. 703-759-2771.
MCLEAN COLONIAL FARM PROGRAM, facts about the flax plant and how to transform bundles of dry stalks into linen fiber, 1-4 p.m., Claude Moore Colonial Farm at Turkey Run, 6210 Georgetown Pike, McLean. $3; seniors and ages 3-12, $2; 2 and younger, free. 703-442-7557.
ALEXANDRIA OCTOBERFEST, a hayride, a pumpkin patch, a silent auction, food, music, children's activities and more, 3-7 p.m., St. Aidan's Episcopal Church and Day School, 8531 Riverside Rd., Alexandria. Free. 703-360-4220.
CHANTILLY CONCERT, HAYRIDE, outdoor bluegrass concert by Shenandoah Travelers, plus hayrides and a campfire, concertgoers should bring a blanket or chair, 6-9 p.m., Sully Historic Site, 3601 Sully Rd., Chantilly. $10; reservations required. 703-437-1794.
FAIRFAX BALLET PERFORMANCE, ballet, modern and Latin dance forms, 8 p.m.; discussion, 7:15 p.m., George Mason University, Center for the Arts, Fairfax. $44, $36, $22; 12 and younger, half-price. 703-218-6500.
GREAT FALLS BALLROOM DANCE, big-band music by the Colvin Run Dance Band, 9 p.m.-midnight; merengue lesson, 8 p.m., Colvin Run School House, 10201 Colvin Run Rd., Great Falls. $12; lesson, $5. 703-430-6557.
ALEXANDRIA HISTORY PROGRAM, "The Ship's Company" living history group interprets life in the Union navy during the Civil War, noon-4 p.m., Fort Ward Museum, 4301 W. Braddock Rd., Alexandria. Free. 703-838-4848.
TEA PARTY, CONSERVATION TALK, with a live and silent auction, door prizes and guest speaker Ravi Corea, president of the Sri Lanka Wildlife Conservation Society, sponsored by Tsunami REACH, a nonprofit organization to help build environmentally sound houses with Habitat for Humanity International-Sri Lanka, noon-4 p.m., Westwood Country Club, 800 Maple Ave. E., Vienna. $30. 540-327-4425 or www.tsunamireach.org.
ALEXANDRIA TEA PROGRAM, naturalist Suzanne Holland demonstrates monarch butterfly tagging, which helps researchers track monarchs' migration to Mexico, followed by a full English tea, 1-3 p.m., Green Spring Gardens Park, 4603 Green Spring Rd. (3.5 miles east on Route 236 from Beltway Exit 6), Alexandria. $24; reservations required. 703-941-7987.
KARKOWSKA SISTERS DUO, piano-violin concert of classical music, sponsored by the Community Concerts Association of Fairfax, 3 p.m., Fairfax High School, auditorium, 3500 Old Lee Hwy. $20; students, $10. 703-273-2547.
FAIRFAX CLASSICAL CONCERT, music by Bach, Bizet, Mozart, Rutter and others performed by area musicians for the Truro Sunday Concert Series, followed by a reception, 6 p.m., Truro Episcopal Church, 10520 Main St., Fairfax. Donations requested. 703-273-1300, Ext. 220.
FAIRFAX CHORAL CONCERT, the a cappella chorus Chanticleer, with folk songs, madrigals, poetry and contemporary compositions, 7 p.m.; discussion, 6:15 p.m. George Mason University, Center for the Arts, Concert Hall, Fairfax. $44, $36, $22. 703-218-6500.
ANTIQUE FURNITURE TALK, conservator Bruce Schuettinger discusses "Regionalism in Furniture Production During the American Colonial and Federal Periods and Its Impact in Virginia," sponsored by the McLean-Great Falls Celebrate Virginia 1607-2007 Community Program, 7:30-9 p.m., McLean Community Center, 1234 Ingleside Ave. $35; McLean residents, $30; preregistration required. Call Francine Proulx, 703-395-7015.
VIENNA TOWN COUNCIL MEETING, 8 p.m., Vienna Town Hall, Council Chambers, 127 Center St. S. 703-255-6303.
VIENNA MOTHERS FIRST MEETING, support group for women who have altered their careers to raise children at home, 10:15 a.m., Patrick Henry Library, 101 E. Maple Ave., Vienna. $28 (annual membership fee). 703-827-5922.
GENDER AND EDUCATION, "A Level Playing Field? Research From American Association of University Women on Gender and Education," by Elena Silva, director of research of AAUW's Educational Foundation, 7-8:15 p.m., University of Virginia, Northern Virginia Center, 7054 Haycock Rd., Falls Church. Free; preregistration required. 703-536-1128.
HERNDON TOWN COUNCIL MEETING, 7:30 p.m., Herndon Council Chambers, 765 Lynn St. 703-435-6804.
RESTON GANG DISCUSSION, "Gangs: Problems and Prevention," sponsored by the League of Women Voters, 7:30 p.m., Reston Museum, 1639 Washington Plaza N. Free. 703-658-9150.
GARDEN, TEA PROGRAM, a guided tour of 20 gardens, followed by a full English tea, 1-3 p.m., Green Spring Gardens Park, 4603 Green Spring Rd. (3.5 miles east on Route 236 from Beltway Exit 6), Alexandria. $24; reservations required. 703-941-7987.
FAIRFAX MOTHERS AND MORE MEETING, a support organization for women who have altered their careers to care for children at home, 7:30 p.m., Fairfax County Government Center, 12000 Government Center Pkwy. Free. 866-716-7766.
-- Compiled by JEAN MACK