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
Leap year starting on Friday share this characteristic. Leap years that begin on Friday, along with those that start on Sunday, occur most frequently: 15 out of the 97 (≈ 15.5%) total leap years in a 400-year cycle of the Gregorian calendar. Thus, the overall occurrence is thus 3.75% (15 out of 400). Like all leap year types, the one starting with 1 January on a Friday occurs exactly once in a 28-year cycle in the Julian calendar, i.e. in 3.57% of years. As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's