Today the city dedicates a new plaque commemorating the Iroquois Theatre fire, which happened 100 years ago today. One of the worst disasters in city history, the fire claimed the lives of 600 men, women and children -- twice the number that died in the Great Chicago Fire of 1871. The plaque will be located in the Loop's Oriental Theatre, a block from the Cook County Administration Building where six people died in a fire last October. [Trib. login: gapers/gapers]