What is the point in having such _days_? Consequently, shouldn't we also have a Scientists' day, an Actors' day, a Plumbers' day, blah blah? Everyone has a place in the universe. All we have to do is never to forget our true calling.
It varies country by country, but I'm pretty sure you'll find various aspects of humanity being celebrated on specific days (women, father/mother, workers, and so on), sometimes even at the UN level (i.e. theoretically worldwide). The point is to get mainstream attention to the achievements and problems of specific and necessary roles which would otherwise be mostly overlooked. In some cases the celebration is named…
Yes I do think the latter title would be more apt. :)