answer: #Person1# invites #Person2# to a concert tonight and introduces the concert to #Person2#.
documents: #Person1#: Would you like to go to a concert tonight?
  #Person2#: I'd like to very much.
  #Person1#: All right, then. There is one at the new concert hall.
  #Person2#: Who's playing?
  #Person1#: It's the Powell orchestra.
  #Person2#: Do you know what they are playing?
  #Person1#: They're doing a seventeenth-century program.
  #Person2#: And who is directing?
  #Person1#: Well, I'm not sure of his name, but I know it's going to be his farewell performance.