Last night Celts and Gaels celebrated Lá Bealtaine, the beginning of summer by getting nekkid and dancing around bonfires:
Ancient Romans celebrated Floralia, festival of Flora, the Roman goddess of flowers, in the last days of April:
In the late 19th Century May Day became the date of celebration of International Organized Labor in commemoration of the 1886 Chicago Haymarket riots. The Haymarket riots were labor rights rallies that became violent due to police provocation in support of the business owners. A homemade bomb was thrown into the crowd at one point and several people died. Despite not being able to determine who threw the bomb, eight labor leaders were charged for murder, some of whom were not even at the riots, and none of whom could be linked to the bombing. A complete lack of evidence linking the accused to the crime did not hurt the prosecution and media propaganda painted a grim picture of the accused, casting them as “long-haired, wild-eyed, bad smelling, atheistic, reckless foreign wretches.” Seven of the eight were sentenced to death and one was sentenced to fifteen years hard labor:
After WWII during Cold War Years of the Mid 20th Century, the USSR added Victory Day to the celebration of International Workers solidarity and paraded their latest weapons through Red Square in the Kremlin:
... and in 1955 during the hey day of the Red Scare when congress adopted "In God We Trust" as the national motto of the good old USA, President Eisenhower proclaimed May 1st to be Loyalty Day! That sure showed them godless Communists!
In the 21st Century, particularly in cities like Los Angeles, both May 1st and Cinco de Mayo have produced demonstrations supporting the rights of immigrants:
...and though this is not a joke, I find myself laughing out loud. In 2017, he Beast "45" turns back the clock to 1955 and directs us all to celebrate National Loyalty Day, "The loyalty of our citizenry sends a clear signal to our allies and enemies that the United States will never yield from our way of life," Trump wrote in a proclamation on Friday. "We are working to destroy ISIS, and to secure for all Americans the liberty terrorists seek to extinguish." :
So whatever your cause for celebration enjoy the day.