Hat Day is held on January 15. This event in the second decade of the month january is annual.
Nothing Day on January 16 (This day was first practiced way back in 1973 by newspaperman Harold Pullman Coffin. The goal of the day is "to provide Americans with one national day where they can just sit without celebrating, observing, or honoring anything.");
Cable Car Day on January 17 (In early 1871 British-born, US resident Andrew Smith Hallidie received the first patent in relation to the cable car);