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May Day is a May 1 celebration with a long and varied history, dating back millennia. Throughout the years, there have been many different events and festivities worldwide, most with the express purpose of welcoming in a change of season (spring in the Northern Hemisphere). In the 19th century, May Day took on a new meaning, as an International Workers’ Day grew out of the 19th-century labor movement for worker’s rights and an eight-hour workday in the United States. May Day 2020 is celebrated on May 1, 2020.
https://www.history.com/topics/holidays/history-of-may-day
