Waiting for opening night BY KEVIN NANCE
By the time Chicago theater critics weigh in on the pre-Broadway runs of "Monty Python's Spamalot" and "All Shook Up" (which have their official openings on Sunday and Jan. 13, respectively), their engagements will be more than half over.<br /> Since word of mouth is already in full swing, we thought we'd listen in on the chatter in the crowd immediately after Tuesday's performances.