Ummm, trees?

Ummm, not what this thing is called... ;-)

Dancing around the Maypole? Crepe paper? Posies? Workers unite? What is this thing called union-building in the spring?

HOLD EVERYTHING! M'aidez. The international distress signal. Tales of rescue. What is this thing called rescue!

Yeah!

Mutt, I'll take Holidays for $200.

What is this thing called International Worker's Day celebrated by socialist and communist governments?

OK, what is this thing called trees?

You didn't scroll down enough....

International Workers' Day

Main article: International Workers' Day

May Day, also refers to various socialist and labor movement celebrations conducted on May 1, to commemorate the Haymarket martyrs of 1886 and the international socialist social movement generally. May Day in this regard is called International Workers' Day or Labour Day, and is a commemoration of the execution of the men who were arrested after the Haymarket Riot of 1886 in Chicago, Illinois, which occurred on May 4 but was the culmination of labor unrest that had begun on May 1. Consequently this May Day became established as an anarchist and socialist holiday, and in this form, May Day has become an international celebration of the social and economic achievements of the working class and labor movement. Although May Day observance began in the United States, it is not officially nor popularly recognized as a holiday there; instead May 1 was officially designated by the U.S. Congress as Loyalty Day in 1958, because of the association of May Day with communism.[4] The Paris Workers Congress held in Paris on the 14-20 July 1889 most notable decision was to call on all workers to celebrate may 1st each year as the international festival of the working class

I'll stick with a basket of flowers, a maypole and a dos equis on the 5th.

What is this thing called paganism in rural England.

That'd be great. I've already got some stuff!