Its known that there are two official days in the year where professional sports are not scheduled. Days where the sports schedule are blank are so rare that I am only aware of 2 going back to the 1970's. One was a random day in the late 90's where nothing happened.

There is an idea some hold that sports & news are actually scheduled months in advance, with popular topics and teams picked out for public attention like its the WWF. The other day where there was no sports was Nixons resignation.