A more accurate explanation of the term dates back to the early 1960s, when police officers in Philadelphia began using the phrase “Black Friday” to describe the chaos that resulted when large numbers of suburban tourists came into the city to begin their holiday shopping and, in some years, attend Saturday’s annual Army-Navy football game.

The connection to the holiday season is a little more vague, but according to Britannica, use of the phrase Black Friday in relation to a widespread sales event might have originated in the early 1960s, when Philadelphia police officers reportedly used it to describe “the chaos that resulted when large numbers of suburban tourists came into the city to begin their holiday shopping,” as well as certain sporting events.