This document summarizes the history of commemorations in Hiroshima after the atomic bombing. It describes how: - The first anniversary in 1946 included a "Peace Restoration Festival" and moment of silence. - The second anniversary in 1947 was declared an official city holiday, and included peace ceremonies, a memorial service, and a peace festival with costumes and floats to revive the economy. - In 1947, General MacArthur sent a note warning of the threat of nuclear annihilation. The Emperor also visited Hiroshima that year. - By the third anniversary in 1948, Mayor Hamai's message to never allow another Hiroshima was inscribed on the new Peace Tower.