John & Yoko/Plastic Ono Band with Elephant's Memory and Special Guests performed these now-legendary sold-out One To One concerts to a combined audience of 40,000 people, raising over $1.5M (equivalent to $11.5M in 2026) for children with intellectual and developmental disabilities. They were the only full-length concerts John Lennon (with Yoko Ono) performed after leaving The Beatles.