"Reassessing Richard Nixon's Declaration of War on Drugs," a panel discussion by White House drug policy advisor Jerome Jaffe, Nixon Library consultant Myles Ambrose, author Michael Massing, and others, is at the Richard Nixon Library & Birthplace, 18001 Yorba Linda Blvd., Yorba Linda. 10 a.m.-2 p.m. Reservations: $15-$20. (714) 993-5075.
"Barney's Musical Castle," a stage show featuring Barney, BJ, Baby Bop and a host of friends on a quest through an enchanted forest, opens at the Anaheim Convention Center, 800 W. Katella Ave. 7 p.m. $11-$30. Continues Thursday, 3 and 7 p.m.; Friday, 7 p.m.; Saturday, 11 a.m. and 3 p.m., and Sunday, 1 and 5 p.m. Shows on Wednesday, Friday and Saturday feature an added performance by Australian entertainment group the Wiggles. (714) 765-8950.
"Goth," a Halloween horror revue by magician Loren Christopher Michaels and BlackDawn Productions, featuring horrific illusions and macabre special effects, opens at the Curtis Theatre, 1 Civic Center Circle, Brea. 8 p.m. $10-$17. Through Oct. 31. (714) 990-7722.
Artistic License Fair, a three-day show and sale of clothing, home decorations, jewelry, wood carvings, basketry, sculpture, kaleidoscopes, furniture, ceramics, and other work by more than 50 artists, begins at Estancia Park, 1900 Adams Ave., Costa Mesa. 10 a.m.-4 p.m. Free admission. Continues Saturday and Sunday, 10 a.m.-4 p.m. (909) 371-6507.
"THX-1138" (1971), George Lucas' first film, with Robert Duvall and Donald Pleasance as residents of an underground city in the 25th century, screens at the Film and Video Center, Humanities Instructional Building 100, UC Irvine. 7 p.m. $5. (949) 814-7418.
If you have an event you would like listed here, send information at least 10 days in advance to Ken Williams, Orange County Calendar, Los Angeles Times, 1375 Sunflower Ave., Costa Mesa, CA 92626. Fax: (714) 966-7790. E-mail: firstname.lastname@example.org