The communists needed a day to meet and celebrate the Haymarket martyrs, and Joseph Dietzgen decided to pick the first of May.
May Day is called 'le premier mai' ('May the 1st') in French.
Le premier mai
May day is a eroupean fesitval and hold on may 1. But i am not sure about the parade, i think maay 1 day tooo!.
sausage day