Yes, this one exists too (just like National Donut Day).
I don't know who gets to make these things up but they seem to catch on, I just wonder how they become a thing.
I imagine it has to be somewhat like the people who start "the wave" in a stadium at a sporting event. Some catch on more than others but they have to start somewhere. And, like the donut, people do love them a good PB&J.