Willie Nelson's Outlaw Music Festival Tour is returning with a lineup of artists including Robert Plant and Alison Krauss, The Avett Brothers, John Fogerty, Nathaniel Rateliff & The Night Sweats, Whiskey Myers, Gov’t Mule, Marcus King, Margo Price, Molly Tuttle & Golden Highway and Brittney Spencer. The tour kicks off June 23 in Somerset, WI; tickets here Friday (3/17).