Black Friday

Definition
Black Friday is a day (usually after thanksgiving in the USA) when people go to shop for products that are in sale or are highly discounted.

In Game Lore
Black Friday was the day when Gordon Amherst with dollar bills that were contaminated with Green poison  went to Abel’s department store and handed the bills with the virus to a cashier which in turn contaminated more people in Midtown Manhattan and then of all New York City and then the rest of the world.