Buy Nothing Day (BND) is an international day of protest against consumerism. In North America, Buy Nothing Day is held on the Friday after U.S. Thanksgiving, concurrent to Black Friday ( November 25, 2016; November 24, 2017); elsewhere, it is held the following day, which is the last Saturday in November. Buy Nothing Day was founded in Vancouver by artist Ted Dave and subsequently promoted by Adbusters magazine, based in Canada.
The first Buy Nothing Day was organized in Canada in September 1992 "as a day for society to examine the issue of over-consumption." In 1997, it was moved to the Friday after American Thanksgiving, also called "Black Friday", which is one of the ten busiest shopping days in the United States. In 2000, advertisements by Adbusters promoting Buy Nothing Day were denied advertising time by almost all major television networks except for CNN. Soon, campaigns started appearing in the United States, the United Kingdom, Israel, Austria, Germany, New Zealand,Japan, the Netherlands, France, and Norway. Participation now includes more than 65 nations.
Explanation thanks to Wikipedia