Louie Louie Day is now officially registered with the National Special Events Registry and Chase's Calendar of Events, the two leading sources of special events, holidays and observances.
April 11 provides an annual opportunity to celebrate the song that has been called best party song of all time, has been recorded more times than any other rock song in history, and was very nearly declared the official state song of Washington State.
Why April 11? Primarily because it's the birthday of Richard Berry, the man who composed Louie Louie. But, in addition, many other important milestones in the history of Louie Louie occurred on or around April 11. Here is a partial list of such events: