Sentence:  The battle of the drib-drool continues , but most of New York 's knowing sophisticates of Abstract Expressionism are stamping their feet impatiently in expectation of V ( for Vindication ) <WSD>Day</WSD> , September first , when Augustus Quasimodo 's first one-man show opens at the Guggenheim . 
Meaning of the word marked with <WSD> tags:  a day assigned to a particular purpose or observance