It began after the Civil War and has continued since that time.
However, sadly, many people today do not know of the origin or real meaning of this Day .
They just consider this to be another occasion for a long weekend in which they have cookouts, perhaps take a short trip, and just generally have fun.
So, before you 'goof off' without knowing the reason for this important Holiday, you might want to learn more about the history of this day and how and why it is intended to be observed. HERE'S THE LINK