"Once-in-a-millennium" celebration of holy days

Good Friday! Happy Purim, Eid, etc... - Time Magazine

In 2008, March 21 has special significance for Christians, Jews and Muslims, as well as Persians, Hindus and Buddhists. In what is described as a "once-in-a-millennium" statistical event, on the same day as Christians remember Jesus' death on Good Friday, there is the Jewish Purim (celebrating the biblical story of Esther), Persian New Year (Narouz), the Sunni
Eid Milad an Nabi (celebrating the Birth of the Prophet), the Hindu Small Holi (an Indian festival of bonfires) and Magha Puja, a celebration of the Buddha's first group of followers, marked primarily in Thailand.