Answer:
Because Dashain, also Bijaya Dashami) is a festival originating from Nepal. In other parts of South Asia, it is called Dashain. Dashain is celebrated by the Hindus of Nepal and the Nepali language speaking people of the Darjeeling hills, Sikkim, Siliguri, Assam and other North-Eastern states of India and among the Lhotshampa of Bhutan and the Burmese Gurkhas of Myanmar. Many people of Nepal celebrate this festival. It is famous in Hindu region.
It is the longest and the most auspicious festival in the Bikram Sambat and Nepal Sambat annual calendars, celebrated by Nepalese people, along with their diaspora throughout the globe. It is the most anticipated festival in Nepal, Bhutan, Burma, and North Indian hills. People return from all parts of the world, as well as different parts of the country, to celebrate together. All government offices, educational institutions, and other offices remain closed during the festival period. The festival falls in September or October, starting from the shukla paksha (bright lunar night) of the month of Ashwin and ending on Purnima, the full moon. Among the fifteen days on which it is celebrated, the most important days are the first, seventh, eighth, ninth, tenth, and fifteenth.
Among the Newar of the Kathmandu Valley, during the Dashain festival, a popular Newari festival called Mohani, is celebrated as the most important festival of Nepal Sambat calendar year. Among Hindu and Buddhist Newars, it is celebrated differently, where each nine days Navaratri (Newar: नवरात्री) leading up to the 10th day called 'Dashami', carry special importance. The goddess Durga and her various manifestations are especially worshiped by Newars throughout the Shaktipeeths of Kathmandu Valley. Among Newars, Dashain is also important for its emphasis on family gatherings as well as on a renewal of community ties, highlighted by special family dinners called Nakhtyā (Newar: नख्त्या) and various communal processions of deities called Jātrā (Newar: जात्रा) throughout the three royal cities of Kathmandu Valley.it is celebrated to worship god durga
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