I believe they use some of the rose garden area for a dessert reservation, though I'm not 100% sure. If you really want to be in front of the castle, then yeah...I'd just plop down before 8pm and find something to pass the time. Here's what we did a few nights ago...watched the parade from Hall of Presidents area. The parade even started a bit late so it was 8:45pm easily by time it passed. We walked quickly toward the front of the park, as we were actually intending to leave. We happened to be right in front of the Crystal Palace when Celebrate started. We easily found chairs to sit in where the outside tables with umbrellas were. While we had to duck our heads a little to see the entire castle (otherwise the umbrella would have blocked the top of the castle), it was still a great view of Celebrate. We watched the entire thing, it was great. The kids were tired and had already seen Wishes, so we "watched" it as we walked down the Main Street sidewalk towards the exit.