Two years ago Bernie came home with some of the top prizes on offer, including the Most Sporting Mascot of the Day award.
This year Bernie will take on furry representatives from 20 sporting teams from all over the UK in a variety of events influenced by the 2012 London Games, including a Toboggan Plunge in the Xscape SNO!zone, Shot Put, Foot Race, Long Jump, Joust and Obstacle Course.
The opening ceremony starts at 10:15am on the grass area in the Theatre District with the final presentation of medals and trophies expected to take place at 4pm - depending on the mischievous nature of the mascots, of course!
You can make a whole day of it with the family with plenty of additional entertainment on offer, such as a funfair, games, activities and live music. Many of the Theatre District's restaurants are also putting on special deals to support the event.
The 2012 Mascot Olympics is supporting Milton Keynes-based charity Visually Impaired Children Taking Action.