I was at the park on Halloween years ago and remember seeing TONS on "rare" villains walking around - my favorite being Shan Yu from the Mulan Parade. But searching around I haven't been able to find any mentions of that in recent years.
Now with the party being so much bigger is there still anything "special" on Halloween itself? Has anyone been on October 31 the past couple years? I'm randomly going to be about 10 minutes away that morning and wondering if it's worth a quick trip over or if it will be "business as usual" at DLR until the party that night.