Malcon and opus1guy, if I can ever buy you a drink at Carthay or Napa or some other concession of your choice, let me know. I am so thankful - without your info I would have A) thought a reservation for guests wasn't possible anymore or B) showed up on Sunday, guest in tow, without actually having one.
Side note: As we were waiting to be escorted up, a gentleman who was seated somewhat unsteadily on one of the chairs started peppering us with questions about where we lived, whether we had been here before, whether we were members, etc. I thought he was trying to get a future invitation back from someone exiting, until he said he was a member. Then he got to the point: what we were drinking?

The look of disappointment on his face when I said it was just cucumber water was priceless. So apparently when a member has had one too many, they send him to the Court of Angels for a Time Out? Perhaps that's a new rule!