Should Christmas perchance fall on a Saturday, then Mad Friday will fall precisely one week before Christmas Eve.
Urban tradition dictates that the erstwhile person will inbible copious amounts of alcohol and fornicate (preferably in pub / nightclub toilets).
Mad Friday has, by Leeds City Council, in a futile attempt to attain Political Correctness, been renamed Feel Good Friday.
Footnote: Also known as 'Black Friday' in the barbarian lands of Scotland.
1st person: If I may trouble you, Sir, may I kindly enquire as to whether you will be attending the organ recital this Friday before Chrstmas?
Mark: "Why would I be?"
Keith: "It's mad Friday!! Lets get, lets get, lets get fuckin' mental!"