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Nyepi is derived from the quiet (silent). Nyepi Day is actually a celebration of Hindu New Year based on Saka calender, which began in 78 AD. Unlike New Year celebrations, Saka New Year begins with a retreat in Bali. There is no activity as usual. All activities are limited, including public services, such as International Airport is closed, but not for hospitals.
The main purpose Nyepi is pleading before Ida Sang Hyang Wasa Widhi, to purify Bhuana Alit (human nature / Microcosmos) and Bhuana General (macrocosmos of the universe). Before Nyepi Day, there are a series of ceremonies performed Hindus, particularly in the area of Bali.
(http://niiapanpan.blogspot.com/2013/03/hari-raya-nyepi-tahun-baru-caka-1935_12.html)
The following is a dialogue about the holiday performed by students of state high school SMA Negeri 5 Balikpapan.