answer: #Person2# tells #Person1# #Person2# will take Susan to a concert and have a surprise party for Susan's birthday tonight.
documents: #Person1#: I hope it rains today.
  #Person2#: Why?
  #Person1#: Well, if it rains on your birthday, it means you will make lots of money this year.
  #Person2#: How do you know?
  #Person1#: That's what my grandfather says every time it rains on someone's birthday.
  #Person2#: We are having a party tonight.
  #Person1#: Are we?
  #Person2#: It's a surprise party. I've invited some friends over. Susan doesn't know about it yet.
  #Person1#: Right. Are you taking Susan to a concert?
  #Person2#: Yes. But I'm taking her to the party afterwards. Why not ask Peter to pick you up at ten?
  #Person1#: Oh, no, that would be too much trouble. I can get there by myself. Where is the party?