Always on January 2nd
There is no substantial information about the origin of this day. Because this is a common expression, suspected to be decided by someone so that a day can be dedicated to display new ideas and concepts. It became popular in the United States during late 1950s and early 1960s.
The day is to create a creative day, to float an idea and to see what people think, or if they notice it. And, there’s no better time to try something new than early in the New Year. So, January 2nd is a good day for Run it Up the Flagpole and See if Anyone Salutes Day.