White Rabbit Day

Takes place 12 times annually, on the 1st of the month of January, on the 1st of the month of February, on the 1st of the month of March, on the 1st of the month of April, on the 1st of the month of May, on the 1st of the month of June, on the 1st of the month of July, on the 1st of the month of August, on the 1st of the month of September, on the 1st of the month of October, on the 1st of the month of November and on the 1st of the month of December.

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References:
en.wikipedia.org/wiki/Rabbit_rabbit_rabbit
urbandictionary.com/define.php?term=white%20rabbit%20day
theguardian.com/notesandqueries/query/0,5753,-18136,00.html