This month, South Coast Repertory stages its 20th annual production of Dickens' A Christmas Carol (through December 26), starring Hal Landon, Jr., who SCR claims is "the longest running Scrooge in the West." Plenty of other seasonal fare is on hand this month, including Troubadour Theater Company' musical parody, Frosty the Snow Manilow (December 2-January 17), melding the TV and song classic "Frosty the Snowman" with the easy-listening sounds of Barry Manilow. Keeping with the spirit, Cabrillo Music Theatre offers Irving Berlin's White Christmas (Fred Kavli Theatre in Thousand Oaks, Dec. 26-29), the nostalgic stage adaptation of the beloved Bing Crosby-Danny Kaye film classic.