It is the longest and the most auspicious festival in the Nepalese annual calendar, celebrated by Nepalese people throughout the globe. It is also celebrated by many Hindus elsewhere. It is the longest and most anticipated festival in Nepal. The festival falls in September or October, starting from the shukla paksha (bright lunar fortnight) of the month of Ashvin 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 and the tenth.
Throughout the country, the goddess Shakti is worshiped in all her manifestations. Dashain is also known for its emphasis on family gatherings, as well as on a renewal of community ties.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 (Source: Wiki)