The film is dedicated to the IX World Festival of Youth and Students that took place in Sofia. Bulgaria. Sofia city. Members of delegations from different countries are walking along the streets. They are greeted by the residents. The festival's fire-lighting ceremony takes place at the stadium. Newsreel. Vietnam South. Houses are burning. Children cry. A meeting of solidarity with the people of Vietnam. The delegates welcomed the Vietnamese representatives, give them gifts. Rally participants walk past the American embassy. Vietnamese and American pacifist delegates communicate. Speakers (synchronously in different languages) rally participants, including E. Tyazhelnikov and V. Tereshkova. Delegates visit the historical sites of Bulgaria. Lay wreaths. Festival participants walk along the streets of Sofia, communicate with each other, sing and dance. The delegates are speaking (synchronously). Sofia stadium. A rally against neo-Nazism. Speakers (synchronously). Young people in industrial enterprises. Talking to workers. House of Friendship. Soviet delegation club. Numerous guests are sitting at the table, talking, singing Russian songs in different languages (synchronously). Pageant. Participants of the beauty contest are passing by. Congratulations to Miss Festival. Landscapes of Bulgaria.