Arrington, VA’s first annual Lockn’ Festival has confirmed some additional details. Grace Potter, who is slated to perform at the festival as a special guest, will sit in with Gov’t Mule during their set tomorrow. In addition, Eric Krasno has been added a special guest to Sunday’s lineup. (Though the exact nature of his appearance is unknown, Kraz toured as Sunday performer Tedeschi Trucks Band’s bassist during their outing with fellow Lockn’ band The Black Crowes this summer.)

Keller Williams will also headline the festival’s official pre-party at Charlottesville, VA’s Jefferson Theater this evening. Lockn’ act Pegi Young & The Survivors will open the night.

Lockn’ will take place at Oak Ridge Farm from September 5-8. Confirmed acts include: Widespread Panic, Furthur, Trey Anastasio Band, The String Cheese Incident, Zac Brown, John Fogerty, Punch Brothers, The Black Crowes, Tedeschi Trucks Band, Gov’t Mule, Warren Haynes Band, Col. Bruce & Friends and The Founding Fathers, among others.