I WAS A TEENAGE ZUCCHINI -- Today at 3 p.m. Dr. Felix Frankenfud and his nephew Andy discover a genetic breakthrough to grow super-size vegetables, but their plans backfire when Andy turns into a giant green squash. Kids wearing costumes get a prize. Thomas Jefferson Community Theatre, 125 S. Old Glebe Rd., Arlington. $10, children $8. 703-548-1154.

FIRESIDE GHOST STORIES -- Today at 6 p.m. Wear your costume for spooky tales, s'mores and hot chocolate. Adults can indulge in Zombie, Werewolf or Smashing

Pumpkin cocktails. The Ritz-Carlton, 3100 South St. NW. $20. For reservations, call 202-912-4110.

FIVE FRIENDS FROM JAPAN: CHILDREN IN JAPAN TODAY -- Opens Thursday. Family Day Saturday, 10 a.m.-4:30 p.m. Through Feb. 13. Ages 5-12. Video messages from Japanese elementary school children teach about their country's food, traditional dress, writing, music, martial arts and more. National Building Museum, 401 F St. NW. Free. 202-272-2448.

MULTICULTURAL CHILDREN'S BOOK FESTIVAL -- Saturday, noon-5 p.m. Featuring readings by African, African American, Asian American, Latino and Native American authors. Kennedy Center, Roof Level Atrium, 2700 F St. NW. Free. 202-467-4600.

CASTLE -- Saturday at 1:30 p.m. Ages 7 and older. A film about a fictional, yet historically accurate, 13th-century Welsh castle. National Gallery of Art, East Building, auditorium, Fourth Street and Constitution Avenue NW. Free. 202-789-4995.

BUNNICULA -- Through Nov. 7. A musical comedy about a vampire bunny based on the book by Deborah and James Howe. Imagination Stage,

Lerner Theatre, 4908 Auburn Ave., Bethesda. $10-$15. 301-280-1660.