Bali’s Nyepi Day - March 7, 2008, marked the Balinese New Year. The exact date of Nyepi varies slightly each year, as it is based on a Lunar calendar - usually near Easter.
On the day before, each village display Ogoh-Ogoh. These are papier-mache "statues" created by the Young Men's Association in each village (desa) or neighborhood (banjar). They are mounted on bamboo platforms. In the late afternoon, you’ll hear firecrackers and small cannons made from bamboo. And around sunset, there is an island wide parade of Ogoh-Ogoh to transform negative energy and drive off the evil spirits.
Nyepi Day itself is a Day of Silence. Having driven off the evil spirits, everyone must now stay quiet for 24 hours (sunrise 7th to sunrise 8th), so that the spirits will think everyone has gone, and there is no one left in Bali for them to bother for the next year - or at least, that's the explanation for children and tourists.
Businesses are closed, except for hotels. No cars, buses, or motorcycles will be on the roads. And Bali is the only place I know of where the government shuts down the airport for meditation & introspection! Balinese stay in their family compounds, dedicating an entire day to introspection and cleansing - intelectual, emotional, and physical. The entire island becomes quiet. There are no cars, no tv's or loud radios, no lamps or fires and no airplanes overhead.