On this date in 1913, striking copper miners and their families gathered for a Christmas party at the Italian Hall in Calumet, MI. The miners, who worked for the Calumet and Hecla Mining Company, were in the fifth month of their strike. At some point in the evening, someone yelled, “fire!” The party-goers — who numbered over four hundred — raced for the exits, which were insufficient to handle a mass evacuation of that size. Seventy-three people, including fifty-nine children, were killed in the ensuing panic. The person (or people) responsible for starting the panic, and the motive for starting it, were never discovered.
New York Times – X-mas Tree Panic Costs 80 Lives
Wikipedia – Italian Hall disaster