Bodhi Day- Lunar Calendar (Buddhist)

Bodhi Day celebrates the day in which Siddhartha Gautama sat underneath the Bodhi tree and attained enlightenment. This one defining moment would become the central foundation upon which Buddhism has been built upon for the last 2,500 years. It is a day on which followers can renew their dedication to Buddhism; reaffirm themselves to enlightenment, compassion, and kindness to other living creatures; and also understand the relevance of this religion as it applies to the modern world. Some traditions celebrate Bodhi Day on the fixed date of December 8th; for others, Bodhi Day is based on the lunar calendar so the date changes year to year.

http://www.holidayscalendar.com/event/bodhi-day/