Here are some possibilities:
Vegan Camps
Camp4Real in Charlottesville, Virginia serves vegan meals. See:
https://www.camp4real.com/summer-camp/
Veg Eco Camp in Canada serves vegan food: https://vegcamp.ca/
Vegan Camp in New Jersey serves vegan food: https://tomorrowsadults.org/camp/summer/
Vegan-Friendly Camps
Camp Zeke is a Jewish camp that will accommodate vegans. They are located in the Pocono Mountains in Lakewood, PA. See: www.campzeke.org
Mountain Camp in California offers a vegan option at every meal as well as a salad bar. See: www.mountaincamp.com/about/food-at-summer-camp
Takodah YMCA camp in New Hampshire offers a vegan option at every meal. See: https://www.camptakodah.org/summer-camp/about/food-nutrition/
Urban Adventure Camps Culinary Camp 2 (vegan cooking) located in Oakland, California. See: https://www.urbanadventurecamps.com/culinary-camp-2/