July 1 day of the Gregorian calendar every year. 19 17 After the victory of the Russian October Revolution, Marxism quickly spread to China. After the May 4th patriotic movement, the first batch of revolutionary intellectuals who accepted Marxism-Leninism, such as Li Dazhao, Chen Duxiu, Dong, set up * * * production groups in various places to publicize Marxism-Leninism and engage in the workers' movement. With the active help of the public property international led by Lenin, 192 1 in July, representatives of various * * * production groups were sent to Shanghai to hold the first congress of China * * * production party. After being discovered by imperialist spies, the meeting was moved to a boat in Nanhu, Jiaxing, Zhejiang to continue. Present at the meeting were Li Da, Li, Dong, Chen Tanqiu, He Shuheng, Chen Gongbo, Bao Huisheng, Zhou Fohai and * * *, representing 57 national champions. Also present at the meeting were Marin, an international representative of * * *, and Nicolschi, an international representative of Redskins. The Congress adopted the Party's Articles of Association, elected Chen Duxiu as General Secretary, and announced the establishment of the China Producer Party. Since then, a brand-new working-class political party has emerged in China, with * * * materialism as its purpose and Marxism–Leninism as its guide. The birth of China's * * * production party has opened up a new era of China's historical development, and made the face of China's revolution look brand-new. During the War of Resistance against Japanese Aggression period, due to environmental difficulties, the exact date of the first congress could not be found, so in 194 1 year, the CPC Central Committee decided to hold the first congress as the birthday and anniversary of the party. That's all I know!