WILLIE NELSON The 19 shows of Willie Nelson’s touring Outlaw Music Festival, this summer and early fall, will include one at the Waterfront Music Pavilion (formerly the BB&T Pavilion) in Camden, Sept. 23. The show will start at 4:30 p.m. and also feature Chris Stapleton, Zach Bryan, Larkin Poe and Brittney Spencer. Tickets go on sale March 25 at 10 a.m., with pre-sales starting March 22 at 10 a.m. Visit ticketmaster.com. The tour starts June 24 in St. Louis. Artists performing on at least one show of the tour include Nathaniel Rateliff & The Night Sweats, Jason Isbell & the 400 Unit, ZZ Top, G…