Sentence:  Nostalgia Week at Lewisohn Stadium , which had <WSD>begun</WSD> with the appearance of the 70 - year-old Mischa Elman on Tuesday night , continued last night as Lily Pons led the list of celebrities in an evening of French operatic excerpts . 
Meaning of the word marked with <WSD> tags:  take the first step or steps in carrying out an action