HEA Dessert Party Question

So we have an HEA Dessert Party on our first night at MK. The closing times of the park changed, this making the Once Apon A Time projection showtime go from 8:25 to 9:45. Will we be able to stay in the Plaza Garden Viewing Area for this, or does the exclusive viewing area access end after the fireworks? Also, can we leave the viewing area and return? If so, I would love to try to squeeze in a meet and greet with Rapunzel and Tiana in between HEA and OAAT.

You can stay but others can also enter that area.