I think the lower level tables are reserved for the people who are staying in Tomorrowland Terrace to see Wishes. The second and third levels seemed to be for the Plaza viewing people. We went in December for a Plaza view dessert party. We went in around 8 for a 9 PM Wishes, and there were several available tables, and we were escorted to one on the second level by a CM. There were plenty of desserts and drinks, which were kept well stocked. There was an announcement about escorting people to the Plaza viewing area around 8:40, but we weren't quite ready to leave yet. A CM said not to worry and to feel free to stay longer. When we were ready to leave, about five minutes before Wishes, a CM escorted the three of us to the Plaza.