This weekend in Columbia about 30 musical acts, from Country and Roots to Soul and Blues, are descending on Stephens Lake Park for the 13th annual Roots N Blues N BBQ Festival . It all starts tomorrow, Friday, Sept. 27, and runs through Sunday, Sept. 29. This year’s lineup features some musical legends like John Prine, Del McCoury, Alejandro Escovedo, Nick Lowe, Patty Griffin … And then there are up-and-comers like headliner Maren Morris and The Black Pumas, plus locals like the Kay Brothers,