Anniversary of the establishment of the Communist Party in Vietnam

The Communist Party of Indochina and Communist Party of Annam, together with individual members of the Communist League of Indochina, merged to form a united communist organization called the Communist Party of Vietnam (Đảng Cộng sản Việt Nam), founded by Hồ Chí Minh at a "Unification Conference" held in Wah Yan College in Kowloon, Hong Kong, from 3–7 February 1930.

At a later conference, per the request of the Comintern, the party changed its name to the Indochinese Communist Party (Đảng Cộng sản Đông Dương), often abbreviated as ICP. During its first five years of existence, the ICP attained a membership of about 1,500 and had a large contingent of sympathizers. Despite the group's small size, it exerted an influence in a turbulent Vietnamese social climate. Poor harvests in 1929 and 1930 and an onerous burden of debt served to radicalize many peasants. In the industrial city of Vinh, May Day demonstrations were organized by ICP activists, which gained critical mass when the families of the semi-peasant workers joined the demonstrations to express their dissatisfaction with the economic circumstances they faced.