Once you have been to DelFest, it is easy to understand why Del picked the location. In Cumberland, Maryland. Tucked into a valley where the Appalachian ridges crowd in close and the Potomac runs alongside town, it’s the kind of place that surprises people the first time they see it. Every Memorial Day weekend, the Allegany County Fairgrounds fills up with campers, music fans, and a whole lot of people who drove or flew a long way.