answer: Han doesn't celebrate Christmas so #Person1# tells Han about Christmas traditions. Han is invited by Professor Smith to a Christmas dinner.
documents: #Person1#: Christmas is coming up. Han Meimei, let me ask you a question.
  #Person2#: Go ahead.
  #Person1#: Do you celebrate Christmas?
  #Person2#: No, we have Chinese New Year's celebrations.
  #Person1#: But Christmas is the biggest holiday of the year. People are busy shopping and preparing presents for relatives and friends before Christmas Eve.
  #Person2#: That sounds exciting.
  #Person1#: Children hang their stockings over the fireplace so that Father Christmas can fill them with sweets and toys.
  #Person2#: What if they don't have a fireplace?
  #Person1#: No problem. They always find some place to hang them. By the way, what are you going to do at Christmas?
  #Person2#: My teacher, Professor Smith and his wife have invited me to a Christmas dinner.
  #Person1#: Sounds great.