Twelfth Day of Ridván
From Bahai9
Work is forbidden on this Holy Day[edit]
"QUESTION: Concerning the Most Great Festival.
"ANSWER: The Most Great Festival commenceth late in the afternoon of the thirteenth day of the second month of the year according to the Bayán. On the first, ninth and twelfth days of this Festival, work is forbidden."
- (Bahá'u'lláh, Kitáb-i-Aqdas, Questions and Answers, no. 1)