It's not too early to start thinking snow. This weekend you can get a jump on the ski season at the Baltimore Ski and Travel Show at Festival Hall. The three-day event features a wide variety of state-of-the- art ski equipment and clothing for sale. There will also be a continuous ski film festival, fashion show, mime theater, door prizes and beer garden. Beginners can get free lessons on an indoor slope.

Admission to the following activities is free unless otherwise noted.

WOODSIDE FAIR -- Friday, 10 to 7; Saturday, 10 to 2, Woodside Church, 8900 Georgia Ave., Silver Spring (four blocks north of Silver Spring shopping center). Baked goods, Christmas novelties, tree decorations, used clothing, books, plants, silent auction. 587-1215.

BAZAAR -- Friday, 4 to 9; Saturday, 9 to 3; Glenmont United Methodist Church, 12901 Georgia Ave., Wheaton. Handmade crafts, silent auction, bake shop, children's room, entertainment. 946-5577.

SKI AND TRAVEL SHOW -- Friday, 6 to 11; Saturday, 11 to 11; Sunday, 11 to 7, Festival Hall, One West Pratt St., Baltimore (next to Convention Center). Take I-95 to Baltimore, exit onto Rte. 395, turn north into city; stay to left. Festival Hall's 11/2 miles on the right). New ski equipment sale, mime theater, free lessons for beginners, film festival, fashions. $4; under 12, free. 301/347-7500.

HAYRIDES -- Friday, 7 and 8:30; Saturday and Sunday, 2, 3:30, 5, 7 and 8:30, Harmon's Hayrides, Meadow Acres Farm, Centreville, Va. Belgian draft horse hayride, campfire time with hot cider and doughnuts. Reservations required. Hayrides (by hour), adults and teens $6; ages 12 and under $4; cider and doughnuts, $3 additional per person. Call 703/327-6731.

FALL BAZAAR -- Saturday, 9 to 4, Poolesville Memorial United Methodist Church, Elgin Road, Poolesville, Md. Flea market, door prizes, Christmas crafts. 972-8097.

HOLIDAY BAZAAR AND YARD SALE -- Saturday, 9 to 5, Faith Lutheran Church, 5701 Livingston Rd., Oxon Hill, Md. 839- 4066 or 839-2019.

ARTS AND CRAFTS BAZAAR -- Saturday, 9 to 3, Hillendale Fire Station, Dale Boulevard, Dale City, Va. A wide range of crafts for sale, raffle, food. 590-4213 or 670-8009.

FALL BAZAAR -- Saturday, 9 to 2, Church of the Nativity, 6400 Nativity Lane, Burke, Va. (go west on Old Keene Mill Road past Lee Chapel Road). All kinds of holiday and everyday crafts, wreaths, baked goods, used books, white elephant, auction. 451-9242.

CHRISTMAS COUNTRY BAZAAR -- Saturday, 9:30 to 4:30, United Methodist Church, 7001 Connecticut Ave. NW, Chevy Chase. Christmas tree ornaments, collectibles, baked goods, white elephants, plants, books. 652-8700.

TILGHMAN ISLAND DAY -- Saturday, 10 to 5, Tilghman Island, Md. (take U.S. 50 east to Easton; follow Rte. 33 south through St. Michaels to parking sign one mile before the island. Park and take free shuttle bus to the information center across from the firehouse on Main Street). A day full of activities all over town. Boat exhibits, boat-docking, jigger- throwing and oyster-shucking contests, rides, music, seafood, skipjack and helicopter rides. $2 per person; $5 per family. 301/745-5530 or 301/886-2566.

CHURCH BAZAAR -- Saturday, 10 to 4, St. Alban's Episcopal Church, Wisconsin and Massachusetts Avenue NW. Carnival, baked goods, hanmade ornaments, auction. 363- 8286 or 244-1713.

BAZAAR -- Saturday, 10 to 5; Sunday, noon to 5, 5606 Ashfield Rd., Alexandria. (From Beltway, take Telegraph Road south five miles; follow signs.) Arts and crafts, ornaments, wreaths; sponsored by the Creative Women of Northern Virginia. 971- 2926.

PARISH FAIR -- Saturday, 10, Epiphany Episcopal Church Parish House, 3125 Ritchie Rd., Forestville, Md. (take Rte. 95, Capital Beltway Exit 11-B one mile). Arts and crafts, country store, baked goods, books, raffle. 301/735-7717.

ANNUAL CHRISTMAS BAZAAR -- Saturday, 10 to 4, St. Luke's United Methodist Church, Calvert Street at Wisconsin Avenue NW. Handicrafts, baked goods, country store, jewelry, thrift shop; parking. 333-4949.

FLEA MARKET -- Saturday, 10 to 3, Mt. Olivet Preschool, 1500 N. Glebe Rd., Arlington (take Glebe Road exits from I-66, turn north on Rt. 120). Secondhand kids' clothes, books, toys. 527-5508.

HOLIDAY ARTS AND CRAFTS BAZAAR -- Saturday, 10 to 5, Takoma Park Municipal Building, 7500 Maple Ave., Takoma Park. Children's crafts, prints, needlework, jewelry, flower arrangements. 270-4048.

HOLIDAY BAZAAR -- Saturday, 10 to 2, Aldersgate United Methodist Church, Fort Hunt and Collingwood roads, Alexandria. Crafts, ornaments, white elephants, baked goods. 765-6555.

OLD TOWN TOUR -- Saturday and Monday, 10:30 a.m.; Sunday, 2, Ramsay House Visitors special tour retracing the steps of George Washington and Robert E. Lee with a colonial- attired guide through the cobblestone streets of Old Town Alexandria. Adults, $3; ages seven to 15, $1.50. 548-0100.

BAZAAR -- Saturday, 11 to 4, Church of the Holy City, 1611 16th St. NW. Antiques, books, plants, baked goods, gifts, white elephants, books, records, clothes, Swedish lunch fare, live auction at 12:30. 462-6734.

SWEET TEETH -- Saturday, 11 to 5, Luther Rice Memorial Baptist Church, 801 University Blvd., Silver Spring. Cake and candy displays, demonstrations, food auctions. Adults, $3; children under 16, $1. 593-8762.

ANTIQUE SHOW AND SALE -- Saturday, 11 to 8; Sunday, 11 to 5, St. John's College High School, 2607 Military Rd. NW. Formal and country furniture, porcelain and glass, paintings, quilts, appraisals. $2.50.

TURKEY DINNER AND BAZAAR -- Saturday, 2 to 8, Bethel United Church of Christ, 4347 Arlington Blvd., Arlington (near intersection of George Mason Drive). A turkey dinner, azaar and auction. Adults, $6; children six to 12, $3. 528-09037.

HUNGARIAN EXHIBIT AND BAZAAR -- Saturday, 10 to 4, Georgetown University, Hall of Nations, Walsh Building, 36th and Prospect streets NW. An exhibit of Hungarian folk costumes, gifts, books; live music and food throughout the day. 966-3608 and 244- 6324.

HOLIDAY BAZAAR -- Sunday, 10 to 5, Congregation Har Shalom, 11510 Falls Rd., Potomac (two blocks from Tuckerman Lane). Several dozen local artisans display jewelry, clothing, Judaica, gifts. 634-9063.

INTERNATIONAL AUCTION -- Sunday, 11 to 1:30, International House, 1825 R St. NW. Antiques and collectibles from around the world to be auctioned, including airline tickets. $3. 232-4007.

COMIC BOOK MART -- Sunday, 11 to 5, Holiday Inn, 5520 Wisconsin Ave., Chevy Chase. Dealers display a wide variety of comic books. $2. 301/398-6685.

HOLIDAY BAZAAR AND DINNER -- Sunday, 11 to 6, Veterans of Foreign Wars, 11316 Fern St., Wheaton. Crafts, ornaments, bake sale, white elephant, country store; smorgasboard dinner from 3 to 6. Adults, $5.50; children 12 and under, $2.75. 301/942-3277 or 933-4394.

ARTS AND CRAFTS FAIR -- Sunday, noon to 4:30, Robert Frost Elementary School, 6419 85th Avenue and Good Luck Road, New Carrollton. Arts and crafts, refreshments. 249-9220