The festival will take place on 22-26 August at Laverstoke Park Farm in Hampshire and from 8-9 September at Cholmondeley Castle in Cheshire.
CarFest is the brainchild of , live music and food whilst also raising money for BBC Children in Need.
Emma Parkinson, stewarding manager at Oxfam, said: "CarFest is such an exciting concept and we’re thrilled to be involved. We’re aiming to double our stewarding service in the next few years and CarFest is a great opportunity to reach a new demographic of people and encourage them to consider volunteering."
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