What's Doing

NSO DECORATORS' SHOW HOUSE -- Friday 10 to 3, Saturday-Sunday from noon to 5. Tour a 10,000-square foot Neoclassical home redecorated by dozens of designers in this 33rd annual benefit for the National Symphony Orchestra. $15 in advance, $20 at the door. At 8295 Alvord St., McLean; free parking with shuttles at satellite lots. 202-416-8149.

WASHINGTON INTERNATIONAL Horse Show -- Featured performances, Friday at 7:30 p.m., Saturday at 1 and 7 p.m.; other events, Friday 7 a.m. to 5 p.m., Sunday 7 a.m. to 6:30 p.m. $15 to $80. MCI Center, 601 F St. NW. 202-397-7328 or 202-628-3200.

FOOD FESTIVAL AND BAZAAR -- Friday and Saturday 11 to 2 and 5:30 to 9. St. Mary Armenian Apostolic Church, 4125 Fessenden St. NW. 202-363-1923.

USED BOOK SALE -- Saturday 8 to 5, Sunday noon to 5. South Mountain Historical Society, 3 E. Main St., Burkittsville, Md. 301-834-4333 or 301-371-9202.

RUMMAGE SALE -- Saturday 9 to 2. St. Margaret's Episcopal Church, 1820 Connecticut Ave. NW. 202-232-2995.

CRAFT FAIR -- Saturday 9 to 3. $3, younger than 18 free. Lake Braddock Secondary School, 9200 Burke Lake Rd., Burke. 703-426-1000.

MID-ATLANTIC ANTIQUES MARKET -- Saturday 10 to 5, Sunday 10 to 4. About 100 dealers. Howard County Fairgrounds, Route 144, West Friendship. 410-228-8858.

FOLK ART & CRAFT FESTIVAL -- Saturday and Sunday 10 to 5. About 90 exhibitors. $7. Ernst Community Cultural Center, Northern Virginia Community College, 8333 Little River Tnpk., Annandale. 703-883-4760.

BENEFIT DOG WALK AND PET FAIR -- Saturday at 10:30; register starting at 9:30. $35, ages 6 to 16 $20, younger free, for the Montgomery County SPCA. Potomac Elementary School, 10311 River Rd., Potomac. 301-299-3748.

BENEFIT FASHION SHOW -- Sunday at 2, for the Montgomery Avenue Women's Center. $35. Hilton Gaithersburg, 620 Perry Pkwy., Gaithersburg. 301-869-1314.

FALL FESTIVAL -- Sunday 2 to 5:30. Music, hay rides, pumpkin maze, face painting. Sponsored by Celebrate Rural Montgomery at Butler's Orchard, 22200 Davis Mill Rd., Germantown. 301-652-8799.

HOLIDAY BOUTIQUE -- Monday 2 to 9, Tuesday 10 to 9, Wednesday-Thursday 10 to 7. Displays by artists and artisans. Vale School House, Vale and Fox Mill roads, Oakton. 703-321-8373 or 703-425-6256.

"DAY OF THE DEAD" CELEBRATION -- Thursday 7 to 10. Music, exhibit of Mexican artwork, film, food. Cultural Institute of Mexico, 2829 16th St. NW. 202-728-1675.