Black Friday (partying) Black Friday (partying) Mad Friday, Frantic Friday or Black Eye Friday is a nickname for the last Friday before Christmas in the United Kingdom. It is the most popular night for office and factories Christmas parties, which consequently makes it one of the busiest nights in the year for ambulances and the police. The term Black Friday originates as "jargon" used by NHS and Police, and has entered the popular lexicon. From 2013, the press began to use the term Mad Friday to avoid confusion with the American Black Friday in November, which was growing increasingly popular in the UK
Friday the 13th year being a common year starting on Tuesday (F) (e.g. 2001/02, 2012/13 and 2018/19), or from August to October the following year being a leap year starting on Saturday (BA) (e.g. 1999/2000 and 2027/28). The shortest period that occurs with a Friday the 13th is just one month, from February to March in a common year starting on Thursday (D) (e.g. 2009, 2015 and 2026). Each Gregorian 400-year cycle contains 146,097 days (with 97 leap days) or exactly 20,871 weeks. Therefore, each cycle contains the same pattern of days of the week and thus the same pattern of Fridays that