He is part of a camp called Playground (alongside other people). The camp collectively brings the speakers, AV, fire effects, generators and structures, sets all of it up, and Carl and other artists perform. He’s probably not setting up the gear himself but he is part of the collective that puts the show on. I do know that he plays Playground fundraisers during the year to raise the money to pay for the costs of the camp, which is a forum of contribution / volunteering.