A day subsequent in time to a given event by some significant period other than a year (especially as prefixed by the amount of time in question).
A day that is an exact number of years (to the day) since a given significant event occurred. Often preceded by an ordinal number indicating the number of years.
Such a day that commemorates a wedding.
A weekday, often a Monday, on which most businesses are closed, and granted to workers as a national holiday.
A closure of banks in a jurisdiction to curtail or prevent a bank run.