By Denny Dyroff, Entertainment Editor, The Times Nellie McKay Nellie McKay was scheduled to perform her first show at Uptown! Knauer Performing Arts Center (226 North High Street, West Chester,www.uptownwestchester.org) back in October. But fate had other plans for the versatile and very talented entertainer. McKay got a featured role in a hit Off-Broadway musical and was forced to postpone...