A Christmas Carol The all-new musical production of the enduring holiday classic, adapted and directed by Christina Harris, will feature traditional song and dance — and some unexpected musical flourishes as well, all in the service of Charles Dickens' heartwarming 1843 fable. Sierra Madre Playhouse, 87 W. Sierra Madre Blvd., Sierra Madre. 8 p.m. Fridays and Saturdays, through Dec. 18; 2:30 p.m. Sundays, Nov. 28-Dec. 19; 2:30 and 7 p.m. Dec. 12 and 19; 8 p.m. Dec. 21-23. $23. (626) 355-4318. http://www.sierramadreplayhouse.org.
LosCon The Los Angeles Science Fantasy Society Convention, as it's known to outsiders, is putting its focus this year on urban fantasy, steampunk, sci-fi noir and, in general, the darker side of science fiction. There is a dizzying amount of events planned, including appearances by writer Emma Bull, author of "War for the Oaks," a pioneering work of urban fantasy. Also on hand: local young adult author Cecil Castellucci, who has lent her youthful zest to a series of books with DC Comics' imprint, "Minx." LAX Marriott, 5855 W. Century Blvd. Through Sunday, $25-$35 a day; $50 for the weekend. http://www.Loscon37.org.
Weezer It seems that Rivers Cuomo and Co. have been feeling nostalgic lately. Earlier this month, they released "Death to False Metal," a collection of previously unreleased songs (including some from the early days), and reissued "Pinkerton," their 1996 flop-turned-fan favorite. This weekend, they're kicking off their "Memories" tour, on which they'll play their self-titled debut album in full one night and "Pinkerton" the next. And don't worry fans — the band will perform other material as well. Gibson Amphitheatre, 100 Universal City Plaza, Universal City. 8:15 p.m. $27.50-$106.25. (818) 622-4440. http://www.livenation.com.
OK Go The dapper princes of power-pop and viral videos return for cuts off their surprisingly funk-driven new album, "Of the Blue Colour of the Sky." A Fine Frenzy and local indie rockers Summer Darling open. Club Nokia, 800 W. Olympic Blvd., L.A. 8 p.m. $19. http://www.clubnokia.com.
The Science of Gingerbread It's not just tasty and seasonally apropos; gingerbread's also a bastion of science. Indulge your sweet tooth and learn about the chemistry and physics of baking. Discovery Science Center, 2500 N. Main St., Santa Ana. 10 a.m.-5 p.m. Monday to Saturday, 11 a.m.-5 p.m. Sunday. Through Jan. 22. $9.95-$12.95. http://www.discoverycube.org.
The 2010 Christmas Holiday Tree Train Families can ride in style to pick out their perfect Christmas trees. The one and only St. Nick will be on board to greet kids of all ages. Fillmore & Western Railway Co., 364 Main St., Fillmore. Saturdays and Sundays through Dec. 12. 10 a.m. and 2 p.m. Adults $24, seniors $22, children 4-12 $14, children 2-3 $10. (805) 524-2546. http://www.fwry.com.