White Rabbit Day

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