John Mayer will perform with Zac Brown Band at this weekend’s Southern Ground Music & Food Festival. Mayer will perform with the country/jam star at the Nashville, TN Lawn at Riverfront Park edition of the fest on Friday, September 21 and Saturday, September 22. Other guests confirmed to join the Zac Brown Band & Friends set include: Gregg Allman, Sheryl Crow, Alan Jackson and Dwight Yoakam. Edward Sharpe & the Magnetic Zeros, Amos Lee, Michal Franti and several others acts will also perform at the annual food and music fest. Mayer recently performed with Allman’s bandmate Derek Trucks in Hollywood, CA.