For 20 years now, TNT and TBS have televised 24-hour marathons of A Christmas Story, the 1983 film version of Jean Shepherd’s funny account of his childhood and holiday memories from the 1940s. And five years ago, Broadway staged a musical adaptation, A Christmas Story: The Musical. And tonight, the Fox network presents a live TV musical version, called A Christmas Story Live!, starring newcomer Andy Walken as young Ralphie. Ralphie’s parents are played by Maya Rudolph and Chris Diamantopoulos, and co-stars include Jane Krakowski, Ana Gasteyer, David Alan Grier, and Ken Jeong.