Academy of Country Music Honors ceremony.The ACM revealed the full line-up of the artists who will be performing at the history Ryman Auditorium in Nashville, Tennessee, during this year's show, including the last four acts to be announced — Trace Adkins, Ronnie Dunn, Alan Jackson and Brittney Spencer.Some of the other A-list performers who will hit the stage for the big show include Lauren Alaina, Devin Dawson, Jessie Jo Dillon, Sara Evans, Nicolle Galyon, Chris Janson, Jamey Johnson, Toby