Here's some details on Dar's appearance at Appel Farm from Charlie Sweeney. Because this fest is held way out in the country, you should plan to arrive early. The road system has a little trouble handling the traffic.
Remote parking is offered with free shuttle service.
The plan is to limit tickets, so I strongly suggest you order your tickets now. The festival features 2 stages. The Meadow Stage is a large relatively flat area. The Grove stage is somewhat smaller, all wood, and is nestled in the trees. This is the stage where Dar will be appearing.