nov 25, 1961 - The first time Black Friday referred to shopping the day after Thanksgiving was in a Philadelphia public relations newsletter.
For downtown merchants throughout the nation, the biggest shopping days normally are the two following Thanksgiving Day. Resulting traffic jams are an irksome problem to the police and, in Philadelphia, it became customary for officers to refer to the post-Thanksgiving days as Black Friday and Black Saturday. Hardly a stimulus for good business, the problem was discussed by the merchants with their Deputy City Representative, Abe S. Rosen, one of the country's most experienced municipal PR executives. He recommended adoption of a positive approach which would convert Black Friday and Black Saturday to Big Friday and Big Saturday.
Added to timeline:
Black Friday Timeline