There are a number of reasons (and ways) that May Day is celebrated around the world, as these comics demonstrate:
Of course, the “real” reason for the holiday is its significance for the labor movement, but that is precisely why it has a somewhat tarnished reputation in the United States…
… especially because of certain militaristic “celebrations” in other parts of the world:
Therefore, since today is not a holiday in the United States, it may be necessary to postpone the celebration: