2 Answers

Presidents Day was 1st a holiday legally designated as "Washington’s Birthday".

Washington's Birthday is a federal holiday held on the third Monday of February. It originally honored the life and work of George Washington, the first president of the United States. Now, other presidents are also honored on this day, which is why it is often known as Presidents' Day.
This legislation moved the legal observance of George Washington 's birthday from February 22 to the third Monday in February. Since Washington's birthday fell so soon after Abraham Lincoln's birthday (February 12), many states chose to combine the two events into President's Day. Other states honor all former presidents on this day.

It is a holiday celebrating Washington, and Licoln as presidents. Used to be 2 days and every body had a holiday.