answer: #Person1# invites Robert to join a birthday party for Mary at Jay's house this weekend.
documents: #Person1#: Hey, Robert, what are you doing this weekend?
  #Person2#: I didn't have any big plans.
  #Person1#: We are putting together a birthday party for Mary.
  #Person2#: That sounds like fun. Where will it be?
  #Person1#: We thought it would be fun to have a pool party at Jay's house.
  #Person2#: Oh good! Can I bring anything?
  #Person1#: We will be providing hot dogs, hamburgers, and cake, but people can bring side dishes.
  #Person2#: I am assuming that the dress is casual.
  #Person1#: Dress casually and bring your bathing suit!
  #Person2#: Wonderful. Just e-mail me the time and date and I'll be there.