answer: #Person2# invites #Person1# to join a baseball party. #Person1# will come after getting back from the airport.
documents: #Person1#: What about coming over on Sunday afternoon for a baseball party?
  #Person2#: A baseball party? What's that?
  #Person1#: This Sunday's baseball game is pretty important. So I'm inviting some people from our class over to my place to watch it.
  #Person2#: I'd love to, but I'm afraid I can't. My brother is coming back from Mexico City. I have to pick him up at the airport.
  #Person1#: That's too bad. Well, how about coming over after you get back from the airport?
  #Person2#: OK, that's great idea. Can I bring anything?
  #Person1#: Whatever you like to drink. We'll order a pizza for dinner.
  #Person2#: That's good.