Now in its second year, 93Q’s autumn shindig at Constellation Field is worth arriving early for. Nothing against headliner Jake Owen, the seasoned (if bro-ish) hitmaker behind “The One That Got Away” and three No. 1s; nor newcomers Frankie Ballard, who scored three Top 10 singles off 2014 debut Sunshine & Whiskey, and LANco, the strapping Nashville lads who enjoyed their first taste of radio success with this summer’s “Long Live Tonight.” The acts to really watch, though, elevate Saturday’s show well above standard country-radio-fest fare. Let’s start with Aaron Watson, the Abilene-raised straight arrow whose 2015 LP The Underdog proved the George Strait model of white-hat traditionalism still packs plenty of commercial clout, shocking the Music City establishment by debuting at No. 1. The other is a trio already getting a lot of mileage off its debut single — Nashville’s Runaway June, whose soaring three-part harmonies and empowerment overtones on “Lipstick” recall the Dixie Chicks, and whose classic Western style goes beyond posing: Singer/guitarist Jennifer Wayne is John Wayne’s granddaughter.