when is "smash your face into the keyboard for no good reason" day?
What about "Punch a Nun" day? Or "Pour chocolate milk on a priest" day.
seriously, things that have been decreed "days" generally have a reason. I could arbitrarily name a few holidays that don't exist and make up backstories if you like.
"The Macaroni Salad with too much pepper" day. This day is inscribed in the ancient texts of the macaroni people, who were, macaroni. During the great upheaval of the Vengeful king Canneloni, they rose up and revolted, this was known as the great peppering, because the macaroni people because very spicy and agitated with their government. The canneloni Council was forced to hire spaghetti spies into the highest levels of the Macaroni administration, but being that the spies were obviously not macaroni and prone to random outbursts they lost many such spies. the Solution they reached was to send in a famous arbitrator, known only as Fettuccine Flounder, in the hopes that the playful alliterative nature of the name would sooth the icebreaking process, which consisted of the two existing in a sauce together. Unfortunately macaroni and seafood don't mix.
The end result was that the macaroni people and their government were in a state of constant flux, moving from one dictatorship to another, constantly overthrown, kinds came and went, the Leonard Lasagna, Thomas Tortellini, and so on, all met with hideous fates.
Finally, on the 50th anniversary of the peppering, a ruler came to power, Sammy Semolina, who understood the needs of every noodle, and tried to provide for them. That day was later called the day, when all noodles came together, into a sort of salad, with celery, bits of onion, cheese cubes. No tomatoes though. they did not attend. Also, since it was the anniversary of the peppering it was necessary to combine that into the name somehow.
That is the story of the noodle wars.