Show times at the Manhattan venue are 8 PM and 10 PM. Mason will be backed by musical director Christopher Denny at the piano and Bob Renino on bass.

Attendees can expect to hear such holiday tunes as "Winter Wonderland," "Silent Night," "Have Yourself a Merry Little Christmas" and "Santa Claus Is Coming to Town." Arrangements were penned by Denny and Barry Kleinbort.

Karen Mason has appeared on Broadway in Mamma Mia!, Sunset Boulevard, Jerome Robbins' Broadway and Torch Song Trilogy. Her Off-Broadway credits include And the World Goes 'Round and Carnival, and she has also been seen on the small screen in "Law & Order" and "As the World Turns." A seven-time MAC Award-winning performer, Mason has charmed audiences at Carnegie Hall, Rainbow & Stars, Davenport's and L.A.'s The Cinegrill. Her solo recordings include "The Sweetest of Nights," "When the Sun Comes Out," "Better Days," "Not So Simply Broadway" and "Christmas! Christmas! Christmas!"

Iridium is located at 1650 Broadway at 51st Street. There is a $30 cover charge ($10 off for MAC, Cabaret Hotline, Cabaret Scenes, NiteLife Exchange, 802, SAG, AFTRA, ASCAP, BMI) and a $10 food/beverage minimum. For reservations visit www.iridiumjazzclub.com or call (212) 582-2121.