Gregg Allman will sit in with Zac Brown Band at the Southern Ground Music & Food Festival. The event will take place October 20-21 at Blackbaud Stadium in Charleston, SC. As previously reported, John Mayer will also sit in with the Zac Brown Band during the festival.

Both Allman and Mayer recently sat in with Zac Brown Band during the country outfit’s Nashville, TN Southern Ground Music & Food Festival. Next weekend’s event will also feature performances by The Avett Brothers, Michael Franti & Spearhead, Grace Potter & The Nocturnals, The Wailers, Charlie Daniels Band, The Jerry Douglas Band and more. You can purchase tickets to the Southern Ground Music & Food Festival here.