These exist, if you’re into folk dance and traditional music! (Eg pinewoods.org stocktonfolkdancecamp.org and more)
Pinewoods Camp, Inc.Pinewoods Camp is a dance and music camp venue in Plymouth, MA where people of all ages can experience the joys of traditional dance, music, and song.pinewoods.orgMelody SchreiberEvery year that goes by, I'm increasingly convinced that adults need summer camps too