Super Saturday or Panic Saturday (Saturday before Christmas)

Entry in progress—B.P.
   
Wikipedia: Super Saturday
Super Saturday or Panic Saturday is the last Saturday before Christmas, a major day of revenue for American retailers, marking the end of the shopping season they, and many customers, believe begins on Black Friday. Super Saturday targets last-minute shoppers. Typically the day is ridden with one-day sales in an effort to accrue more revenue than any other day in the Christmas and holiday season. The date is slightly more likely to fall on December 22, December 19 or December 17 (58 in 400 years each), than on December 21 or December 20 (57), and slightly less likely to occur on December 23 or December 18 (56).