“Some kings wear boots” — on July 27 Alan Jackson is headlining “Chattahoochee Strong,” a benefit at Estancia at Thunder Valley in Boerne, Texas, pouring relief and hope into Hill Country flood victims. Joining him for this one-night porch jam of gratitude are Wade Bowen, Jamey Johnson, and other Texas greats — tickets start at $1,000, with first responders in free for a true Southern show of heart and solidarity…