My fiance and I are going as well. We were going to dress up, but I figured if we went to the park early that day, that I wouldn't want to wear my costume all day, or didn't want to have to worry about renting a locker, and finding some place to change later on. We decided to make Halloween T-shirts instead. Ours are posted on the T-shirt thread. We're looking forward to it, it sounds like a lot of fun!