One other great thing about the MK opening ceremony is that it is the only time that you get to see the "Lilly Belle" steam train (unless you go on the Behind the Steam Trains tour). It is an older train with open seats (ie. no railings on bars to block people from falling out). This was the highlight of our trip for my Father in Law. If you get there by 8:45am you'll definitely see the show. Have a great time!