answer: Michael and Rebecca are going to Sarah's surprise birthday party. Rebecca will phone Sarah's husband for a hidden parking place.
documents: #Person1#: Michael, what time is it? We are going to be late for the party.
  #Person2#: It's a quarter past six. Don't worry, Rebecca. We will be fine.
  #Person1#: But we have to be at Sarah's house by 6:30 for her surprise birthday party. The traffic is getting heavier.
  #Person2#: Relax. The party starts at 7:00 o'clock. We are not far from her house now. But I do need help with finding a place to park the car, so Sarah doesn't see it. Can you phone her husband and ask him where it is best to park our car?
  #Person1#: OK. I'm calling him now.