Do you live your life on social media? Then you probably get informed about every fake holiday there is. These weird holidays have been around forever, because the National Broccoli Association said that National Broccoli Day should fall on such-and-such date, etc. etc. College Humor tells us about them in this video that contains NSFW language.
Yes, there are more of those holidays now than ever before. Yes, they used to be only of interest to radio disc jockeys looking for a joke. And they had to buy books to keep up with those weird obscure holidays. But now we have Twitter! And millions of people who have nothing to say except for passing along the knowledge that today is National Sweater Day or whatever.