Kagami Biraki (鏡開き) is a Japanese traditional ceremony which literally translates to "Opening the Mirror" (from an abstinence) or, also, "Breaking of the Mochi." It traditionally falls on January 11 (odd numbers are associated with being good luck in Japan) but, in practice outside of Japan, generally occurs around that date. It is generally the first important event of the year after New Years Day. It refers to the opening of a Kagami mochi, or to the opening of a cask of Sake at a party or ceremony.