We did the Dessert Party last week and was at the very front of the reserved area.
For those that are not familiar with the layout, there is the stage, a viewing area, a walkway they tape off running parallel to the stage, and then the rest of the viewing area. The Dessert Party area is just beyond the walkway.
Something I noticed about the crowds ... people reserved their spots early by sitting. When the show started, they stood up. The result was that the entire front section between the walkway and the stage collapsed forward leaving a pretty sizable gap at the back.
It would seem to me that a person could wait until right when the show started to use that walkway and find a spot at the back of the forward viewing area.
Obviously it is a risk because if the crowd does not move forward, you'll be out of luck to find a good viewing spot.