It is a public holiday in over 80 countries.
May 1 each year is observed as International Workers' Day (also known as International Labor Day or May Day) across the world. The occasion's main objective is to celebrate the contributions of workers to society and to empower them to understand their rights. Moreover, it marks the anniversary of the Haymarket riots and pays tribute to all those people who lost their lives there.
It is one of the most important holidays in communist countries such as China, Cuba, Laos, Vietnam, North Korea, and the former Soviet Union countries.
Notably, the United States and Canada celebrate Labor Day on the first Monday of September.
In 1889, the Marxist International Socialist Congress adopted a resolution for a "great international demonstration" to support the workers' demands for an eight-hour workday. In 1891, International Workers' Day was formally recognized at the annual event of the International's second congress.
Marxist theorist Rosa Luxemburg wrote in 1894, "As long as the struggle of the workers against the bourgeoisie and the ruling class continues, as long as all demands are not met, May Day will be the yearly expression of these demands. And, when better days dawn, when the working class of the world has won its deliverance then too humanity will probably celebrate May Day in honor of the bitter struggles and the many sufferings of the past."
There are seminars, parades, and rallies around the world to spread knowledge among workers about their rights. Also, many workers celebrate the day with picnics, barbecues, and other public gatherings.