The Day After Thanksgiving (Friday) is known as Black Friday. This used to be unofficially or officially the start of holiday shopping season. Almost all stores come out with Doorbuster Sales with the early bird special to attract consumers to their shop. People stand in line hours before the stores are opened, to grab the bargains of the year. In last few years, we have witnessed a trend towards bringing those Black Friday Sales online before Friday.
Black Friday is no more a one-day event.
In last few years (starting from 2013 to be precise), Black Friday Sales have started way before Friday-with some stores starting their Black Friday sales on Thanksgiving day & some even starting on Wednesday and Monday. It would not be surprising to see Black Friday sale starting on Monday on the Black Friday week. As a result, revenue wise Black Friday is NOT the biggest day for stores. Biggest sales day now include Thanksgiving day, Green Monday and Cyber Monday.