Gone-ta-pott Day

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

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