<human>:  When did the Great Chicago Fire happen?
<bot>: The Great Chicago Fire happened on October 8, 1871. It was a fire that burned down the city of Chicago and caused over $200 million in damage. It started on a Sunday evening in the densely populated downtown area. The fire was caused by a combination of factors including the dryness of the air, the high winds, and the wooden buildings that were used to construct the city.