December 31

As regards the celebration of the Christian Holidays by the believers: it is surely preferable and even highly advisable that the friends should in their relation to each other discontinue observing such holidays as Christmas and New Year, and to have their festal gatherings of this nature instead during the intercalary days and Naw-Ruz. (From a letter dated 26 May 1982, written on behalf of the Universal House of Justice to a National Spiritual Assembly; The Compilation of Compilations, vol. III, Cultural Diversity in the Age of Maturity)