International Workers' Day, also known as Labour Day in some places, is a celebration of laborers and the working classes that is promoted by the international labor movement, anarchists, socialists, and communists and occurs every year on May Day, 1 May, an ancient European spring holiday. The date was chosen for International Workers' Day by the Second International to commemorate the Haymarket affair, which occurred in Chicago on 4 May 1886.

Being a traditional European spring celebration, May Day is a national public holiday in many countries, but in only some of those countries is it celebrated specifically as "Labour Day" or "International Workers' Day". Some countries celebrate a Labour Day on other dates significant to them, such as the United States which celebrates Labor Day on the first Monday of September.

In Slovenia, May 1 (and also May 2) is a day off work and a day out of school. There are many official celebrations all over the country. In Ljubljana, the capital, many people go to Rožnik Hill in the city. On the night of April 30, bonfires are burned on many hills.

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