WINDOW ORNAMENT DESIGN -- Today, 1 -- 4 p.m. Ages 5 and older. Create festive holiday window ornaments out of plexiglass and colorful cellophane. National Building Museum, 401 F St. NW. $4 per project. 202-272-2448.

WINTER SCAVENGER HUNT -- Thursday at 4 p.m. Ages 2-6. After learning about how animals survive in the cold, search for places where they might find shelter and food. Rock Creek Park Nature Center, 5200 Glover Rd. NW. Free. 202-895-6070.

WINTER FAMILY FESTIVAL -- Saturday, 10 a.m.-3 p.m. Learn how people living south of the equator celebrate the holidays. Programs include music and dance of the Andes, flamenco dancing, a rain forest adventure, craft workshops and storytelling. Walters Art Museum, 600 N. Charles St., Baltimore. Free. 410-547-9000.

HOLIDAY CARD WORKSHOP -- Saturday at noon and 2 p.m. Local art teacher Mary Arcuri returns with her workshop on creating hand-crafted cards for the holidays. Materials include canceled stamps. National Postal Museum, 2 Massachusetts Ave. NE. Free. For reservations, call 202-633-5533.

SANTA FLY-IN -- Saturday, noon-4 p.m. Santa gives the reindeer a rest, and instead arrives via helicopter for holiday arts and crafts. Plus, photos with St. Nick are taken in the museum's mock biplane. College Park Aviation Museum, 1985 Cpl. Frank Scott Dr., College Park. $4, seniors $3, students and children $2. 301-864-6029.

HOME SWEET HOME: GINGERBREAD HOUSE WORKSHOP -- Saturday, 2-4 p.m. Families assemble and decorate their own gingerbread houses. National Building Museum, 401 F St. NW. $50 per family. For reservations, call 202-272-2448.