Showboating: Tim McGraw, Trace Adkins, Big and Rich + Cowboy Troy and 2 Foot Fred, Gretchen Wilson, Little Big Town, the Nitty Gritty Dirt Band, Kellie Pickler, Joe Nichols, Gloriana, Steve Holy, David Nail, Jessie James, Love And Theft, the McClymonts and Matt Kennon are among the performers slated for the Show Me Music And Arts Festival June 17-19 in Springfield, MO.