It was a toss-up which was the more incongruous sight at Jazz at Lincoln Center’s benefit gala the other night: Crosby, Stills and Nash wearing suits and ties as they played with the Jazz at Lincoln Center Orchestra, or Glenn Close parading with Wynton Marsalis’ musicians amidst tables during the after-dinner. Michael Douglas, who sat with CNN honcho Jeff Zucker, might have had a “Fatal Attraction” flashback. In the concert, which featured new arrangements of the band’s classics by orchestra members, still-dapper Graham Nash told the crowd, “Today is Judy Collins’ birthday” as he introduced “Suite: Judy Blue Eyes,” the song she inspired. Stephen Stills teased a tech man after a glitch, “Another one like that and you go back to Neil Young,” and David Crosby cheerfully admitted his songs were “herbally enhanced.” The evening — which drew Lloyd Blankfein, Mayor Bloomberg, David Geffen, Larry Gagosian and Jill and Robert Wagner — raised more than $3 million.