Tomorrow is one of the very few (two, I think) public holidays in Germany that are not related to Christianity. If you would like to find out more about the origins of Labor Day, read this 1894 piece written by Rosa Luxemburg.
The first of May demanded the introduction of the eight-hour day. But even after this goal was reached, May Day was not given up. As long as the struggle of the workers against the bourgeoisie and the ruling class continues, as long as all demands are not met, May Day will be the yearly expression of these demands. And, when better days dawn, when the working class of the world has won its deliverance then too humanity will probably celebrate May Day in honor of the bitter struggles and the many sufferings of the past.
Enjoy tomorrow’s celebrations and stay safe!