Square Nintendo Armistice Day

Recognized annually on its anniversary, Square Nintendo Armistice Day remembers March 9, 2002 when news broke that Square and Nintendo were once again on working terms following a feud resulting in no Square publishing on Nintendo systems since 1996.

It's worth noting that news broke March 8 in some areas of the world, but since it originated from March 9 morning newspaper reports in Japan, I consider that to be the day of note.