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Online registration for both the Marathon and ½ Marathon has been extended to Sunday, April 20. Visit cmmarathon.com for all the details. Participants not only get to run in a world-class race but can catch some of Nashville’s hottest bands on 28 entertainment stages along the way. Members of Diamond Rio and the group’s Team Rio will once again compete in the event. That evening, all race participants are treated to a free concert at Nashville’s Sommet Center, featuring Lady Antebellum plus Steve Cropper and Friends, beginning at 7 p.m.