Society of American Archivists (SAA) has designated May 1st as MayDay, or a day of action for both individuals and organizations such as archives, libraries, museums, and historical societies to improve their capacities to deal with emergencies that can threaten or destroy historical collections. The ravages of natural disasters such as the tornadoes and hurricanes of recent years are just some of the physical risks facing cultural heritage institutions.
Although the landmark study, A Public Trust at Risk: The Heritage Health Index Report on the State of America's Collections (2005), systematically documented that most institutions lack an adequate disaster preparedness plan, the SAA has worked to mitigate these deficiencies. The SAA web site provides recommendations for MayDay activities, as well as a compilation of resources, including technical literature and tools, disaster plan templates and examples, tutorials and courses, bibliographies, and other resources.
May 1st, of course, is also International Workers' Day, which serves to commemorate the anniversary of the Haymarket Affair in Chicago. The eight-hour workday was a central demand of the Chicago labor movement in the 1860s, and a week-long, city-wide strike began on May 1, 1867. The strike collapsed, but the issue remained, with the Federation of Organized Trades and Labor Unions in 1884 calling for workers to take direct action and begin observing the eight-hour day on May 1, 1886. More on IWD can be found in the Common Curator post, the 125th Anniversary of the Haymarket Affair.