Some events may require reservations or advance ticket purchases. Call before you visit.

"SEASONS GREETINGS FROM THE NATIONAL MALL" -- Open daily 10 to 5 through Jan. 8. See the Garden Court transformed into a miniature Mall, with model trains, replicas of the Capitol and other buildings, decorated trees. Free. U.S. Botanic Garden Conservatory, 100 Maryland Ave. SW. 202-225-8333.

"JOY TO THE WORLD" -- Open Tuesdays-Saturdays 10 to 5, Sundays noon to 5, through Jan. 30. An exhibition of about 150 Nativity scenes collected from six continents. Free. Pope John Paul II Cultural Center, 3900 Harewood Rd. NE. 202-635-5400.

GINGERBREAD HOUSE EXHIBITION -- Through Dec. 11, open daily noon to 5. The sixth annual exhibition of gingerbread houses by local bakers. $1. Darnall's Chance House Museum, 14800 Gov. Oden Bowie Dr., Upper Marlboro. 301-952-8010.

"MERRY OLD TOWN MANASSAS" -- Dec. 2 at 6, tree-lighting ceremony at the Manassas Museum, 9101 Prince William St., Manassas. Dec. 3 at 10, 60th annual Christmas Parade through downtown Manassas. 703-361-6599.

TREE-LIGHTING CEREMONY -- Dec. 2 from 6:30 to 8. Entertainment, petting zoo, live Nativity, children's activities. Free. Great Falls Village Centre, Georgetown Pike and Walker Road, Great Falls. 703-759-2485.

HOLIDAY WEEKEND -- Dec. 3 from 10 to 3, "Holiday Magic," with magic shows, children's crafts, blacksmith demonstrations; $5 plus crafts fees. Dec. 4 from 1 to 4, "Hearthside Sampler," tours of the manor, decorated for the holidays; $4. Children's Museum at Rose Hill Manor Park, 1611 N. Market St., Frederick. 301-694-1650.

WINTERFEST CELEBRATION -- Dec. 3 from 10 to 5. Music, crafts, games, holiday greens. Sandy Spring Friends School, 16923 Norwood Rd., Sandy Spring. 301-774-7455, Ext. 180.

LAKE ANNE CELEBRATION -- Dec. 3 from 11 to 1. Entertainment, petting zoo; Santa arrives by barge at 12:30. Free. Lake Anne Village Center, 1639 Washington Plaza, Reston. 703-437-7730.

FINNISH CHRISTMAS PROGRAM -- Dec. 3 at 1:30. Children's activities and snacks; Santa visits at 2; caroling at 3. Free. Lutheran Church of the Redeemer, 1545 Chain Bridge Rd., McLean. 703-734-0319.

TREE-LIGHTING CEREMONY -- Dec. 3 at 7, with entertainment and children's activities. Bowie City Hall, 2614 Kenhill Dr., Bowie. 301-809-3011.

"HOLLY TROLLEYFEST" -- Open Saturdays and Sundays from 5 to 9, through Dec. 18. Seasonal decorations, toy trains. Trolley rides, $3, seniors and ages 2 to 17 $2. National Capital Trolley Museum, Northwest Branch Park, 1313 Bonifant Rd., Colesville. 301-384-6088.

TREE-LIGHTING CEREMONY -- Dec. 4 from 4:30 to 6, with caroling and refreshments. Free. Waters House, 12535 Milestone Manor Lane, Germantown. 301-762-1492.

HOLIDAY TREE LIGHTING -- Dec. 8 from 6 to 7, with entertainment and snacks. Montgomery Village Center, Montgomery Village Avenue, Montgomery Village. 301-948-0110.

"WINTER WONDERLAND" -- Dec. 9 from 6 to 9 in downtown Bethesda, strolling entertainers and ice sculpture demonstration in Veterans Park, Woodmont and Norfolk avenues; Dec. 10 from 1 to 3, entertainment by school choruses at Veterans Park. 301-215-6660.

WINTER FAMILY FESTIVAL -- Dec. 10 from 10 to 3, a celebration of international winter traditions with storytelling, music and crafts. Free. The Walters Art Museum, 600 N. Charles St., Baltimore. 410-547-9000, Ext. 300.

SCANDINAVIAN CHRISTMAS FESTIVAL -- Dec. 10 1 to 6. Entertainment, folk dancing, refreshments, children's activities; St. Lucia pageant at 5:30. $6, ages 6 to 12 $3, ages 2 to 5 $1, younger free. Lutheran Church of the Redeemer, 1545 Chain Bridge Rd., McLean. 703-734-0319.

COUNTRY CHRISTMAS -- Dec. 10 from 3 to 6. Crafts, caroling, marshmallow-roasting, displays of antique toys. $4, ages 2 and younger free. Colvin Run Mill Historic Site, 10017 Colvin Run Rd., Great Falls. 703-759-2771.

"CHRISTMAS IN CAMP" -- Dec. 10 from noon to 4. Open house with a 19th-century Santa Claus, living history portrayals, guided tours, readings of "The Night Before Christmas." $2, children $1. Fort Ward Museum & Historic Site, 4301 W. Braddock Rd., Alexandria. 702-838-4848.

HOLIDAY FAMILY DAY -- Dec. 10 from noon to 4. Music by Navy Band units, caroling, refreshments. U.S. Navy Memorial, 701 Pennsylvania Ave. NW. 202-737-2300.

SWEDISH CHRISTMAS FESTIVAL -- Dec. 11 from 1:30 to 4:30, with entertainment, snacks, St. Lucia pageant. Free. St. James Episcopal Church, 11815 Seven Locks Rd., Potomac. 703-734-0319.

"18TH-CENTURY CHRISTMAS WASSAIL" -- Dec. 11 from 1 to 4. Entertainment, games and snacks re-creating Christmas in Colonial America. $3, seniors and ages 3 to 12 $2. Claude Moore Colonial Farm, 6310 Georgetown Pike, McLean. 703-442-7557.

"HOLIDAY MAGIC ON ICE" -- Dec. 10 at 1:30. Ice show by medal-winning competitive skaters. Free. Fort Dupont Ice Arena, 3779 Ely Pl. SE. 202-584-5007.

NATIVITY EXHIBITION -- Dec. 16 from 7 to 9, Dec. 17 from 6 to 9. Displays of about 100 nativity scenes from around the world. Church of Jesus Christ of Latter-day Saints, 4100 St. John's Lane, Ellicott City. 240-461-3466.

"RUSSIAN WINTER AFTERNOON" -- Dec. 17 from noon to 5. A celebration of Sviatki, a Russian-style holiday season, with tours of the estate decorated for the holidays and performances of "The Snowmaiden," a puppet show by Purple Rock Productions. Reservations required. $14, children $5. Hillwood Museum and Gardens, 4155 Linnean Ave. NW. 202-686-5807.

"TRAINS AND PLANES" -- Dec. 17-23 from 10 to 5. Tour the museum, decorated for the holidays, with a model train exhibition by National Capital Trackers. $4, seniors $3, ages 2 to 18 $2, younger free. College Park Aviation Museum, 1985 Cpl. Frank Scott Dr., College Park. 301-864-6029.

"HOLIDAY SHIMMER ON ICE" -- Dec. 17 at 1:30. Musical ice show by Washington Figure Skating Club members. Free. Fort Dupont Ice Arena, 3779 Ely Pl. SE. 202-584-5007.

CHILDREN'S HOLIDAY PARTY -- Dec. 18 at 7, with "The Nutcracker" by Bob Brown Puppets, refreshments and a visit by Santa. Free. Deerfield Run Community Center, 13000 Laurel-Bowie Rd., Laurel. 301-776-2805.