As night falls, the band of Amateur Art Troupe of Workers' Cultural Palace plays beautiful music in the night, attracting people who come to participate in entertainment activities. Director Hu of the knitting mill found the secretary of the Youth League branch and asked him to help the backward worker Li Da. Da Li often plays poker after work, leaves the heavy housework to his wife, goes to work to sleep and gets sick. If he fails to meet the production target, the couple often quarrel. Director Niu of the Cultural Palace enthusiastically helped the mischievous young man and told him the great significance of the activities of the Cultural Palace, which made the young man who lacked cultural knowledge make progress day by day. Director Niu saw that Director Hu was prejudiced against his factory workers and their daughters attending the Cultural Palace, so he personally found Director Hu, publicly criticized him, and put forward his own views on how to enlighten and educate young people, which greatly inspired Director Hu. On the eve of the national day cultural performance, director Niu of the cultural palace invited those engaged in art design. Fei Jing's family suffered misfortune, lost their daughter and were at a loss about the future. Since she participated in the amateur cultural activities in the Cultural Palace, she has regained the hope of life among optimistic people in the new environment. With the enthusiastic help of director Niu, the backward Li Dage also began to make progress. On Sunday, he volunteered to work overtime in the factory. Director Niu came to Li Dage's house with young activists waiting to participate in cultural activities in the Cultural Palace to help him dismantle the idle shed. Brother Li and his wife were deeply moved. Seeing this series of changes, Director Hu, who came to visit relatives, also hoped to come to the Cultural Palace to participate in activities. Director Niu is busy preparing for the performance of amateur art troupe, not only neglecting housework, but also forgetting the festive day of the 30th wedding anniversary. His wife Ouyang Zhi was furious and ran to the performance venue to find her husband. When she found director Niu, all the friends of amateur art troupe came to congratulate them on their wedding anniversary, which made Ouyang Zhi smile through tears. The festive fireworks were colorful and dazzling. With the sweet light music, Director Niu warmly entertained the people who came to the party, and everyone was immersed in the beautiful night.

Director Hu of the knitting mill found Li Da to help the backward worker, and Director Niu went to help the cheated youth. Director Niu saw that Director Hu was biased against and participated in the activities of the Cultural Palace. He personally found Director Hu and publicly criticized him. Director Hu readily accepted it. The bandit Jing Jia suffered misfortune and lost his daughter. Since taking part in the activities of the Cultural Palace, she has regained hope for life. Director Niu was busy with the activities of the Cultural Palace and the work in the factory, and forgot to marry his wife. His angry wife came to see him, only to find that all the friends from the art troupe had come to celebrate, and everyone was immersed in a wonderful evening.