There’s no such thing as “Presidents’ Day,” at least officially. Yes, in 1971 Congress decided that more long weekends would be good for us and so created the Uniform Monday Holiday Act. What it DID do is combine Washington’s and Lincoln’s birthdays into a day for all Presidents, a holiday that would always be on a Monday, despite when those two guys were born.
What it did NOT do is officially name the day, which means that “Presidents’ Day” does not, technically, have a real name.
There’s your bit of trivia for the day. Named or not named, enjoy the day!