This day was created for people who are skeptic. Defining skeptic: these are people who are questioning the facts and the theories that usually people believe on. These are the people who have the curiosity around them.
They usually disbelieve what others normally believe on. This day is for people who are apt to doubt things that they perceive. Skeptic people are the “misbelievers”.
There are three dates in the calendar where one can celebrate and be skeptical about it: January 13th , October 13th and the first Friday the 13th of the year.
Though the day is not that important, during these days, one can be a skeptic person in his own right. One can be a skeptic person in any day of the year as long as you feel like doubting or you are already in doubt.