Labor Day gets celebrated here in the US on the first Monday in September. It was born as a campaign year bone for labor in 1894. An accounting of the birth of Labor Day can be found HERE.
Because there is the constant fear in the country of capitalism of anything that might smack of the rights of workers, particularly rights that might limit the acquisition of capital by the big boys, the September date was considered preferable to May 1st., the international worker's day and a northern European day of romp and circumstances beyond control. Puritan Capitalist America was not interested in uppity workers or end of winter romps in the hay, so Haymarket and Haystacks were out, end of summer and return of serious working weather was in.
We Americans, of course, turned the whole affair into a long weekend with a bit of a patriotic flair. We get to have speeches (although very tame) on labor and the worker's contribution to society. There might be a real union speech every once and awhile. There might even be some minor connection in the ever widening election cycle of a relation between worker's rights and the strength of America, etc.
As far as I can tell, however, the worker's right to protest is not an item on the agenda any more, nor are the conditions of the working poor who are essentially indentured servants of the upper classes. We Americans don't talk about this particular elephant (since elephants have become a symbol of a party)...but here it is: The elephant in the room is that the working poor will be working forever without escape from servitude. Of course there are exceptions. Of course hard work can lead to bettering one's own condition. But hard work and exception also requires the hard press for rights - the rights to organize, to protest poor working conditions, lack of basic necessities, and so on.
We sing patriotic songs on Labor Day, and good for us. American, under the best of circumstances, is a great land of opportunity. But we also might want to sing "Arise, you prisoners of starvation! Arise, you wretched of the earth!" and if we get nervous because it is, well, a communist song, then change the words a bit. But keep the fire in it.