Gone-ta-pott Day

Takes place 12 times annually, on January 28th, on February 28th, on March 28th, on April 28th, on May 28th, on June 28th, on July 28th, on August 28th, on September 28th, on October 28th, on November 28th and on December 28th.

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References:
gone-ta-pott.com/national_gone-ta-pott_day.html