2007-05-01 12:17:44 UTC
Loyalty Day is celebrated with parades and ceremonies in communities across the United States, although many people in the United States remain unaware of it. Although a legal holiday, it is not a federal holiday.
Then I found this in wikipedia.com:
International Workers' Day (a name used interchangeably with May Day) is a celebration of the social and economic achievements of the international labour movement. May Day commonly sees organized street demonstrations by hundreds of thousands of working people and their labour unions throughout Europe and most of the rest of the world — though, as noted below, in neither the United States nor Canada. More-radical groups such as communists and anarchists are also given to widespread street protest on this day as well.
And also:
The United States has its own Labor Day holiday, celebrated on the first Monday in September instead of on May Day. However, in 2006, May 1st was chosen by immigrant groups in the United States as the day for the Great American Boycott, a general strike of immigrant workers and supporters to protest H.R. 4437.