White Rabbit Day

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

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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