18TH-CENTURY CRAFT FAIR -- Saturday-Sept. 18, 9 a.m.-

5 p.m. Colonial-attired artisans demonstrate 18th-century crafts such as stone-cutting, gunsmithing and soap-making at the 10th-annual fair. Entertainment includes music, a sword swallower, a tightrope walker, puppets and appearances by George Washington. Includes Potomac River sightseeing cruises at Mount Vernon's Wharf at 10:30 and 11:30 a.m., 12:30, 2 and 3 p.m. Mount Vernon, southern end of George Washington Parkway, Mount Vernon. $11, seniors $10.50, 6-11 $5, younger than 6 free. 703-780-2000.

THE MAGIC OF HANS CHRISTIAN ANDERSEN -- Saturday at 9:30 and 11 a.m. Applause Unlimited presents three of the Danish storyteller's best-loved tales, "The Ugly Duckling," "Thumbelina" and "The Emperor's New Clothes," using puppets, masks and marionettes. National Theatre, Helen Hayes Gallery, 1321 Pennsylvania Ave. NW. Free. 202-628-6161.

BUGFEST 2005 -- Saturday, 10 a.m.-4 p.m. Exhibits feature many aspects of arthropodal life; scientists discuss insect habitats, behavior and their relationships with other animals. Activities include "The Great BugFest Hissing Cockroach Races" and craft tables for illustrating butterflies or weaving insects out of drinking straws. National Museum of Natural History, 10th Street and Constitution Avenue NW. Free. 202-633-1000.

INTERNATIONAL CHILDREN'S FESTIVAL -- Saturday-Sept. 18, 10 a.m.-4 p.m. The 35th-annual festival features youth performers from Georgia, India, Mexico and Nigeria. Other activities include music video creation, poster-making, visual art activities and movement workshops featuring yoga and West African dance. Wolf Trap, 1624 Trap Rd., Vienna. $10, seniors and ages 3-12 $8, 3 and younger free. 703-218-6500 or 703-938-2404.

CHILDREN'S DAY: GARDEN ENCHANTMENT -- Saturday, 11 a.m.-4 p.m. A day of activities and entertainment designed to encourage an interest in the world of plants. Arts and crafts and nature studies explore seeds, fruits, roots, stems, leaves and flowers. Brookside Gardens, 1800 Glenallan Ave., Wheaton. Free. 301-962-1400.