Peace lesson on September 1 in the first grade. First-grader Matvey talks about his vacation at the Olympian International Children's Camp. Children, vacationing in the camp, sing, play, dance, participate in sports competitions. Boy Matvey attends the opening ceremony of the XII World Festival of Youth and Students in Moscow, at the Lenin Stadium in Luzhniki. Delegations of youth are on the sports arena of the stadium. Sung by Dean Reed. The illusionist E. Kio is performing at the circus arena.