answer: Kangkang is going to Xu Song's concert this Saturday evening while Jane's going to visit her uncle.
documents: #Person1#: Hi, Kangkang.
  #Person2#: Hi, Jane.
  #Person1#: What are you going to do this Saturday evening?
  #Person2#: I'm going to a concert.
  #Person1#: How exciting! Who is going to sing at the concert?
  #Person2#: Xu Song. He is my favorite pop singer.
  #Person1#: Where is he going to give the concert?
  #Person2#: In the gym.
  #Person1#: What time is it going to start?
  #Person2#: At 7:30 p. m. Would you like to go with me?
  #Person1#: I'd love to, but I'm going to visit my uncle.