Lessons have been learned and Lockn’ just seems to grow bigger and better with yet another A-List entertainer being announced. Organizers of next month’s Lockn’ music festival, have announced that Tom Petty and the Heartbreakers will headline Saturday night. In addition to the new live music offerings, coordinators are working to improve traffic flow into the event. Camping spots will be closer to the performance area. Bicycles will be permitted on festival grounds; and more local vendors will be attending. The event in Nelson County runs from Sept. 4-7 and will feature a star-studded lineup, including country legend Willie Nelson and Rock & Roll Hall of Famers the Allman Brothers Band, among others.