May Day was first officially celebrated in May 1917 under the Provisional Government. That year, there was even an attempt to merge the two holidays — Easter and Labor Day — but it fell flat.

In some countries, May Day is a public holiday for workers, including France, Kenya and China, where it lasts five days. In Russia, Communist-led May Day celebrations were once massive affairs.

Mother's Day in the U.S. is celebrated on the second Sunday of May, which is Sunday, May 11 in 2025. The holiday's origins in the U.S. trace all the way back to the post-Civil War era, with ...