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The OneAmerica 500 Festival Mini Marathon is the nation’s largest half marathon. 2016 will mark the 40th anniversary of the Mini! Interested runners and walking can register for the 2016 race during the 2015 Mini Expo, which will be on April 30th and May 1st, 2015. All 2016 registrants will have the opportunity to purchase one of our training shirts, which will be designed to reflect the Bicentennial, the 40th anniversary of the mini and the 100th running of the Indianapolis 500.