Bis gestern kannte ich den Ausdruck „Black Friday“ nicht, dank Wikipedia bin ich nun aber schlauer:
Black Friday is the Friday after Thanksgiving in the United States, which is the beginning of the traditional Christmas shopping season. The term dates back to at least 1966, although its usage was primarily on the East coast. The term has become more common in other parts of the country since 2000. Because Thanksgiving falls on the fourth Thursday in November in the United States, Black Friday occurs between the 23rd and the 29th of November.
Also am Freitagmorgen mal bei Apple vorbeischauen (die Aktion läuft ab Freitag 0.00 Uhr):