The following article contains an answer for the question: What was the song played as the final encore by duo that was interrupted by a man shouting "I need to talk to you!"? , can you please find it? 

"The Late Great Johnny Ace" was interrupted when an audience member ran to the stage and shouted at Simon: "I need to talk to you!" The man was carried away by security, and Simon finished the song. The incident provoked associations to the song's lyrics, in which Simon speaks as a first-person narrator concerning the deaths of Johnny Ace, John F. Kennedy and John Lennon. Lennon's murder by an obsessed fan had taken place less than a year previously, not far from the concert site. Despite this association, Simon said that he was not afraid of any on-stage incidents. In May 1982 as a guest on Late Night with David Letterman, he explained that while it is not unusual for fans, for example, to jump onto the stage with flowers, this action was new to him, but also felt that the man simply appeared intoxicated. His greater concern was that the song's premiere was ruined.Lyrics referring to the New York area produced audience applause, such as Garfunkel's ode to his home city, "A Heart in New York", which describes from a New Yorker's point of view the first glimpse of the city when returning there by air:
New York, lookin' down on Central Park, where they say you should not wander after dark
Applause broke out during "The Sound of Silence", when the narrative voice refers to a large crowd of people in the dark:
And in the naked light I saw ten thousand people maybe more
After the 17th song, "The Boxer", which contained an additional stanza not included in the album version, Simon & Garfunkel thanked the audience and left the stage, but returned to deliver an encore of three songs – "Old Friends / Bookends Theme", "The 59th Street Bridge Song (Feelin' Groovy)" and "The Sound of Silence". Simon then said that their planned use of pyrotechnics had been disallowed, and told the crowd, "Let's have our own fireworks!" Many spectators sparked lighters. The duo then introduced the members of the backing band and gave a final encore, a reprise of "Late in the Evening".

Late in the Evening