Widespread Panic and John Fogerty have joined the lineup for the Interlocken Festival. Panic will play two of the festival’s four nights, and Fogerty will sit in with the group during one of those shows. In addition, Furthur have confirmed that they will play three of the inaugural event’s days, including an exclusive performance of the Grateful Dead’s classic Workingman’s Dead. The band will also offer bonus set for fans who purchase a Super VIP tickets. As previously reported, Interlocken will take place in Arrington, VA from September 5-8.

In other news, Interlocken has confirmed that The Black Crowes will perform two shows during the festival, while The String Cheese Incident will play on two of the event’s four days. One of those shows will feature the debut collaboration of the Zac Brown Incident, a one-time-only collaboration with country/jam star Zac Brown. Neil Young will also perform an extended set with Crazy Horse. Additional acts will be confirmed in the coming weeks.

The festival’s promoters are H.O.R.D.E. co-founder Dave Frey and Relix publisher Peter Shapiro. Artist pre-sale tickets will be available beginning May 22 at 10am EST and general “early bird” tickets will go on sale May 23 at 10am EST. All Tickets will be sold via interlockenfestival.com.