The film is dedicated to the communist subbotnik in Moscow on April 17, 1971: Muscovites go to the subbotnik, a rally in the Moscow-Sortirovochnaya depot. Production processes at the "Hammer and Sickle" plant, the Moscow House-Building Plant, the "Red Proletarian" plant, in the greenhouses of the "Moskovsky" state farm, at the Lenin Komsomol, the Moscow Watch Factory, at one of the textile enterprises, at a furniture factory. The work of students of Moscow universities on the improvement of the city.