NSO DECORATORS' SHOW HOUSE -- Friday and Monday-Thursday from 10 to 3, Saturday-Sunday from noon to 5, through Oct. 31. Tickets are $15 in advance, $20 at the door. 8295 Alvord St., McLean. 202-416-8727.
2005 SOLAR DECATHLON SOLAR Village -- Friday, Tuesday and Thursday from 11 to 4, Saturday-Monday from 9 to 6. Tour student-made houses and learn about solar energy. The National Mall, between 7th and 14th streets NW. 1-800-342-5363 or www.solardecathlon.org.
ANTIQUES SHOW & SALE -- Friday from 11 to 7, Saturday from 11 to 6, Sunday from noon to 5. $4.50. Vienna Community Center, 120 Cherry St. SE. 703-255-6360.
GREEK FESTIVAL -- Friday-Saturday from 11 to 10, Sunday from noon to 9. Food, music and dancing. St. Katherine Greek Orthodox Church, 3149 Glen Carlyn Rd., Falls Church. 703-671-1515.
SIX FLAGS AMERICA'S FRIGHT FEST -- Friday from 5 to 10, Saturday-Sunday from noon to 10, through Oct. 30. Haunted houses and train, hayride and shows. $39.99; ages 55 and older and children 53 inches and smaller, $28.99; ages 3 and younger free. Five miles east of the Beltway on Route 214 in Largo. 301-249-1500.
FALL WINE FESTIVAL & SUNSET Tour -- Friday-Sunday from 6 to 9. Sample wines from 16 vineyards and tour George Washington's home and wine cellar. $25. 3200 Mount Vernon Memorial Hwy., Mount Vernon. 703-573-7328.
JAYCEES COMMUNITY YARD SALE -- Saturday from 7 to 3. Anthony Lane Elementary School, 7137 Beulah St., Alexandria. 703-866-7171.
FLEA MARKET -- Saturday from 8 to 1 (a benefit for Giving Circle of HOPE). Sunrise Valley Elementary School, 10824 Cross School Rd., Reston. 703-264-0186.
INDOOR FLEA MARKET -- Saturday from 9 to 1. More than 40 vendors, plus the Truly Tasteless Treasure Contest. Good Luck Community Center, 8601 Good Luck Rd., Lanham. 301-552-1093.
SCOTTISH HIGHLAND GAMES -- Saturday from 9 to 5:30. Music, dancing, children's activities, sheepdog exhibits, food and more. $10; seniors, $8; ages 12 to 18, $3; ages 12 and younger, free. Anne Arundel County Fairgrounds, 1450 General's Hwy., Crownsville. 410-849-2849.
INDOOR CRAFT SHOW -- Saturday from 9 to 3. Sponsored by Wesley Chapel United Methodist Church. Urbana Fire Hall, Route 355, Urbana. 301-662-2324.
ALL-MARYLAND REPTILE SHOW -- Saturday from 9 to 3. Non-venomous reptiles and related goods. $5. Havre de Grace Community Center, 100 Lagaret Lane, Havre de Grace. 410-526-4184 or 410-838-1578.
GREAT SCALE MODEL TRAIN SHOW -- Saturday from 9 to 4, Sunday from 10 to 4. With the All-American Hi-Rail & Collectors train show, plus rare train films and children's train cartoons. $7; ages 12 and younger free. Cow Palace, Maryland State Fairgrounds, York and Timonium roads, Timonium. 410-730-1036.
CATOCTIN COLORFEST ARTS & Crafts Show -- Saturday-Sunday from 9 to 5. Food and vendors from more than 350 artists and craftspeople. Free admission. At Thurmont Community Park (on Frederick Road), Guardian Hose Company and Thurmont Middle School (both on East Main Street), Thurmont. 301-898-7308 or 301-271-4432.
ALEXANDRIA ARCHAEOLOGY DAY -- Saturday from 10 to 3. Tour the Shuter's Hill excavation site with an archaeologist. Free. Behind the George Washington Masonic National Memorial, 101 Callahan Dr., Alexandria. 703-838-4399.
PATUXENT RIVER APPRECIATION Days -- Saturday-Sunday from 10 to 5. Boat rides, live music, children's activities, arts and crafts vendors, free museum admission, parade on Sunday at 2. Free. Calvert Marine Museum, Route 2/4 South in Solomons. 410-326-2042.
MEDIEVAL FAIRE -- Saturday-Sunday from 10 to 4. Costumed reenactors depict life for Saxons, Norman and Vikings in the 11th-15th centuries, with living history camps, battle reenactments, storytelling and more. $5; ages 4 to 18, $2; ages 3 and younger, free. Marietta House Museum, 5626 Bell Station Rd., Glenn Dale. 310-464-5291.
ORCHID SHOW & SALE -- Saturday from 10 to 5, Sunday from 10 to 3. Browse orchid displays, art and sales tent. Free admission. National Arboretum, 3501 New York Ave. NE. 202-245-4523.
MARYLAND RENAISSANCE FESTIVAL -- Open Saturday and Sunday from 10 to 7, continuing 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.
BROOKLAND FESTIVAL -- Saturday from 11 to 4. Parade, performances, exhibits and children's activities. 12th Street between Monroe and Otis street NW. 202-529-8400.
FALL FAMILY FUNANZA -- Saturday from noon to 4. Petting zoo, magic show, bungee run and rock wall and rescue worker demonstrations. Southside Park, 1315 Ross Dr., Vienna. 703-255-6360.
GREENBELT PARK FALL FESTIVAL -- Saturday noon to 5. Live music, games, hay rides, arts and crafts and more. Free. Sweetgum Picnic Area, 6565 Greenbelt Rd., Greenbelt. 301-344-3944.
CAPITOL CITY OKTOBERFEST -- Saturday from noon to 7, sponsored by the Mid-Atlantic Brewers' Association. Beer tasting, food by Washington Saengerbund and entertainment by Edelweiss Band and the Alpine Dancers. Admission is free; tasting is $20. Capitol City Brewing Company, 2700 S. Quincy St., Shirlington. 202-310-4691.
MARKOFF'S HAUNTED FOREST -- Saturday from 6:30 to 10:30, Thursday from 6:30 to 9, through Oct. 31. Haunted trail, plus hayrides, movies, food and more. $15 to $20. Camp Calleva, Martinsburg Road off White's Ferry Road, Poolesville. 301-216-1248.
BETHESDA ARTIST MARKET -- Sunday from 10 to 5. Nearly 30 local artists will display and sell their work, with live music by the BCC High School String Quartet, Jerry Haines and Spencer Bates. Bethesda Place Plaza, 7700 Wisconsin Ave., Bethesda. 301-215-6660.
JEWISH HOLIDAY FAIR -- Sunday from noon to 3. Arts, crafts and cooking workshops, live music, food and more. Free. Jewish Community Center of Northern Virginia, 8900 Little River Tpk., Fairfax. 703-323-0880.
HAUNTED DECATUR HOUSE TOURS -- Thursday at 6:15 and 7:15, continuing through Oct. 27. Tour the house by candlelight and hear stories about the historic home. $7.50; students, $6. 1610 H Street NW. 202-842-0920, ext. 239.