In the United States, January 16 is National Nothing Day. San Francisco Examiner columnist Harold Pullman Coffin created the holiday in 1973 "to provide Americans with one national holiday when they can just sit without celebrating, observing, or honoring anything." From Checkiday.com:
It is ironic that it was created "to protest the proliferation of special days," as another holiday was started by its creation. Although it is meant to be a day when people do nothing, there are various other holidays that are observed on January 16 which undermine its message. Additionally, new holidays continue to be added on any given day of the year. Coffin also created the National Nothing Foundation, although it appears this no longer exists. Coffin himself passed away in 1981, but his holiday of nothing has continued to be celebrated—we think. It's a little hard to measure the popularity of a holiday where you do nothing.