This weekend features more Oktoberfests, fall festivals, flea markets and bazaars than you can shake a stick at.

Admission to the following activities is free unless otherwise noted.

ANTIQUE SHOW AND SALE -- Friday, noon to 9; Saturday, noon to 8; Sunday, noon to 6, Vienna Community Center, 120 Cherry St. SE, Vienna. More than 40 dealers from all over the East Coast display and sell antiques; food available. $2.50. 938-8000.

GREAT GEORGETOWN GARAGE SALE -- Saturday, 9 to 6, Parking lot, Riggs Bank, corner of M and Wisconsin, Georgetown. Merchandise donated from area merchants hits the lot. 333-3577.

CRAFT SHOW AND FLEA MARKET -- Saturday, 9:30 to 4, Village Center, Great Falls, Va. (take Exit 13 off Beltway; follow Georgetown Pike 7 miles, center on the left). Flea market featuring antiques, clothing, baked goods and more. 759-2456.

CHRISTMAS BAZAAR -- Saturday, 10 to 4; Sunday, 9 to 2, St. Hugh's Parish, Grenoble Hall, 135 Crescent Rd., Greenbelt (take Exit 23 off the Beltway to Kenilworth Avenue east; turn right onto Crescent Road; church is one mile on the right). Handcrafted items, bake sale, gourmet table, plants. 474-1706.

CAT FANCIERS -- Saturday-Sunday, 10 to 5, Airport Holiday Inn, 890 Elkridge Landing Rd., BWI Airport. Many rare breeds gather from across the nation; also see the only domesticated leopard in the country. $2.

ALTERNATIVES FESTIVAL -- Saturday- Sunday, 10 to 6, Dupont Circle Park, Connecticut and Massachussets avenues NW. A two-day fest featuring live music and celebrating cultural diversity. 462-7352.

OKTOBERFEST -- Saturday, 10 to 4, Bellemead property behind Amoco station, Century Boulevard, Germantown, Md. Crafts fair, bake sale, auction and more. 338-1014.

HARVEST FESTIVAL -- Saturday, 10 to 6, St. Luke's Church, 15th and P streets NW. Bake sale, international food, flea market, books, games, fortune teller. 563-4187.

OLD TOWN TOUR -- Saturday and Monday, 10:30 a.m.; Sunday, 2, Ramsay House Visitors Center, 221 King St., Alexandria. Retrace the steps of George Washington and Robert E. Lee with a colonial-attired guide through the cobblestone streets of Old Town Alexandria. Adults $2; ages 7 to 15, $1. 548-0100.

HARVEST CRAFT SHOW -- Saturday, 11 to 3, Tauxemont Preschool, 7719 Fort Hunt Rd., Alexandria. Baskets, pottery, wreaths, children's gifts and handicrafts. 765-5768.

SMALL IS BEAUTIFUL -- Saturday-Sunday, 11 to 5, Sheraton Exhibition Center, New Carrollton. A two-day show featuring miniature trains, dollhouses, toys. Adults $1; children under 12, free. 301/795-7447.

FALL FESTIVAL -- Saturday, 11 to 5, intersection of Main Street and University Drive, Fairfax. More than 470 exhibitors display their crafts; food and live entertainment. 385-7858.

ITALIAN FOLK FESTIVAL -- Saturday, 11 to 5, Market Square, 301 King St., Old Town, Alexandria. Italian food, crafts and entertainment. 838-4843.

VICTORIAN CRAFT FAIR -- Saturday and Sunday, noon to 4, Surratt House and Tavern, 9110 Brandywine Rd., Clinton, Md. Artisans display crafts from the 19th century, including a variety of needlework, pottery, toys, chair caning and more. 301/868-1121.

OKTOBERFEST -- Saturday, 1 to 7, Hard Bargain Farm, 2001 Bryan Point Rd., Accokeek, Md. (take Beltway to Indian Head Highway Exit south; go 10 miles and turn right on Bryan Point Road. Farm is 2.7 miles on right). Costumes, music, dance and German food specialties. $2. 292-5665.

SQUARE DANCE -- Saturday, 8 to 10:30 p.m., Arlington Forest Methodist Church, U.S. 50 and N. Henderson Street, Arlington. The NOVA Group performs with a caller; beginners and singles welcome. $4. 430-9006 or 241-0993.

SORT-OF-NEW SALE -- Sunday, 10 to 3, Richard Montgomery High School, intersection of Viers Mill Road and Rte. 28, Rockville (off Rockville Pike). Clothes for all ages, jewelry, housewares, appliances, books records and more. 984-2323.

RECORD MART -- Sunday, 10 to 6, Annapolis Guard Armory, Willow Avenue and Hudson Street, Annapolis (take U.S. 50 to West Street Exit; make left on Willow). 60 dealers put thousands of records, of all styles, on the block. $2. 301/757-6182 or 301/229- 5385.

VEGETARIAN PICNIC -- Sunday, noon, Rock Creek Park, Grove 10. Bring vegetarian dish and recipe; non-vegetarians welcome. 949- 8349.

CHINESE FESTIVAL -- Sunday, 1 to 5, Chinatown, (H Street between Sixth and Seventh streets). A parade, dragon dance, lion dance, Chinese Folk dance, Kung Fu demonstrations and music celebrating the National Day of the Republic of China. 638-1041.