December 24
72 copper miners’ children die in panic caused by a company stooge at Calumet, Mich., who shouted “fire” up the stairs into a crowded hall where the children had gathered. They were crushed against closed doors when they tried to flee - 1913
And this: December 24, 1913 - Seventy-four people in Calumet, Michigan, died in what became known as the "Calumet Massacre." About 500 youngsters and their parents had been taking part in a Christmas party for the children of striking copper miners, when someone yelled "Fire!" Within minutes, although there was no fire, dozens were trapped in a stairwell and trampled. The person who yelled was never identified, although many strikers said they thought it was a company guard. The copper strike dragged on until April 1914, but by then many of the strikers had left Calumet, forever touched by the Christmas party disaster.
Labor history found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_12_24_2010