Loretta Lynn has canceled her Sunday (July 17) appearance at Jamboree in the Hills in Belmont, Ohio, due to illness. Lynn was recently hospitalized for serious dehydration after extreme heat in Tennessee, according to The Associated Press. She has been replaced by Sammy Kershaw and JD and the Straight Shot. The music will now begin at 9:45 a.m. on Sunday, according to the event's Facebook page. The four-day festival begins Thursday night (July 14) and features Toby Keith, Miranda Lambert, Tim McGraw and Montgomery Gentry, among many others.