International Labor Day, also known as "May 1 International Labor Day" and "International Demonstration Day" (International Workers' Day or May Day), is a national holiday in more than 80 countries in the world. It is set on May 1st every year. It is a holiday shared by working people all over the world.

In July 1889, the Second International led by Engels held a congress in Paris. The meeting passed a resolution stipulating that international workers would hold a parade on May 1, 1890, and decided to designate May 1 as International Labor Day. The State Council of the Central People's Government made a decision in December 1949 to designate May 1 as Labor Day. After 1989, the State Council basically commended national labor models and advanced workers every five years, commending about 3,000 people each time.

Excerpt from Baidu Encyclopedia - May 1 International Labor Day