First of May

That's right.
It's the first of May!

And, per Wikipedia:

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, which also coincides with the Celtic spring festival.^[1][2] 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.^[2] This Day has its origins in the labour union movement, specifically the eight-hour day movement, which advocated eight hours for work, eight hours for recreation, and eight hours for rest.^[3]
Being a traditional European spring celebration, May Day is a national public holiday in many countries, but in only some of those countries it is 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.

 Or, if your prefer, you can dance around a maypole.