Moscow city. Spring 1981. Festively decorated, illuminated streets, buildings of the city during the working days of the XXVI Congress of the CPSU, May 1. May Day demonstration on Red Square. Opening of the monument to the Revolution of 1905-1907 on Krasnopresnenskaya Square. Members of the commission for the decoration of the capital by May 1st are discussing sketches in the Main Architectural and Planning Department of the city. Types of festively decorated streets, buildings in the cities of Lvov, Rostov-on-Don on the eve of May 1st. The colorfully decorated Rostselmash plant.