Miranda Lambert is kicking off her Roadside Bars & Pink Guitars Tour on Sept. 13—and she’s bringing some heavy hitters with her on select dates, including Maren Morris, Elle King, the Pistol Annies, Tenille Townes, Ashley McBryde and Caylee Hammack. The 26-date tour kicks off on Sept. 13 in Uncansville, Conn., making additional stops in…