The dates of most festivals are fixed by famous astrologers after consulting the lunar calendar. The biggest and most popular festivals are: Dashain, a celebration of Goddess Durga victory over evil Mahisashur; and Tihar, a celebration of lights dedicated to Goddess Lakshmi.

It is not hard to catch colorful processions in different streets of the Valley almost every other day of the week. Cultural acts of dances and songs are integral parts of some celebrations while some celebrations are just quiet family gatherings. Grand celebrations like Ghode Jatra and Gai Jatra entertain participants and spectators every year.

The Swasthani Festival takes place between January and February. The Goddess Swasthani's three eyes burn like the sun. She is the ultimate giver of gifts although if insulted, she can make life miserable.

By worshipping Swasthani, Parbati attained Lord Shiva as her husband. In the worship rites of Swasthani (as set out by Parbati) the Swasthani Scripture is read every evening for one month. Worshipping Swasthani is believed to remove curses, unite parted relatives and could result in limitless gifts.

In addition to holy bathing and worship of shrines, certain auspicious foods like till laddoos (sea same seeds ball cakes), chaku (molasys), ghee (clarified butter), sweet potatoes, khichari (mixture of rice and lentils) and green leaf spinach are taken on this day. Families come together and share these delights. Married daughters and families are invited to parental homes for festivities and blessings. Yet another occasion to renew family ties. Many homes have pujas (religious ceremonies) conducted by priests with chanting from holy books, for which they receive alms.

Like any other holy celebration Maghi Sankranti also has a legend of its own. It recalls that once a merchant from the town of Bhadgoan despite of his thriving business noticed that his supply of sea same seeds hadn't diminished. When looking into the matter he found an idol of the Lord Vishnu hidden deep beneath the seeds. Since, then on this day the Til Mahadev idol is worshipped with the belief that god will continue to be generous in the supply of food and wealth on the Bhadgoan community. It's also the day commemorating the death of Viswapitamaha, the elderly grandfather of two families of Pandavas and Kauravas, between whom the famous battle of Mahabharata took place. He was determined not to die until the way to the region of gods opened. While lying on the bed of arrows he discovered words of wisdom on life and death. Eventually, through his free will he succumbed to death. Hence it's believed that those who die on this day go to heaven, released from the burden of rebirth. Maghi Sankranti is yet another occasion which renews the faith of Nepalese people in the heavenly powers.

Saraswati Puja or Shree Panchami is a day to celebrate the birthday of Saraswati – the Goddess of Learning. This is a day when people from school students to scholars worship their pens and books to please the Goddess and expect her favor in their studies so they become wise and knowledgeable.

People also throng around the idol of Goddess Saraswati, especially in Swayambhunath and offer flowers, sweets, fruits, etc. On this day, small children are taught to read and write and people write on the stones and slabs with chalks and pencils. This day falls between January/February which is regarded as a very auspicious day for marriages too as it is believed that Goddess Saraswati herself blesses the couples. Normally it is the astrologers who fix the marriage date and time in Nepal.

This is the New Year of the Tibetans and Sherpa of Nepal which falls in the month of January, February. The Buddhist monasteries in Kathmandu like Boudhanath and Swayambhunath are decorated with eye catching colorful prayer flags pulling the crowd. The people perform their traditional dances and welcome their New Year with feasts and family gatherings wearing all the new clothes and finest jewelries and exchanging gifts. These dances can also be seen in Khumbu, Helambu and other northern regions on Nepal.

Shivaratri or the night of Lord Shiva that falls sometime between February/March is one of the major festivals of Nepal. This day is dedicated to the Lord of the Lords – Lord Shiva or Mahadev ho lived in Mt. Kailash in the Himalayas. Lord Shiva is the most worshipped God in the Hindu religion. More than 100,000 of Hindu devotees from India and Southeast Asia throng weeks ahead of the festival and gather in and around Pashupatinath temple – one of the holiest shrines of the Hindus in Kathmandu to pay their homage to Lord Shiva on his birthday. “Pashupatinath” literally means “the Lord of animals” as Lord Shiva is considered as the guardian and protector of everything that exists in the Himalayan Kingdom. On this holy day, worshippers take dip and bath in the holy river at early dawn and fast for the whole day and stay around fire to keep them warm as it is still winter in Nepal. In the afternoon an official function is held to celebrate this festival at Tundikhel. The Nepal Army organises a show in which series of gun fire are sounded. The devotees also freely indulge in using marijuana and other intoxicating substances as these things are believed to please Lord Shiva and marijuana use is legal only on this sacred day

This festival of water and colors that falls between February/March is also known as “Fagu” in Nepal. This day is observed to rejoice the extermination of female demon Holika who together with her King Brother conspired to kill his son Pralhad, an ardent devotee of Lord Vishnu. This day, playful people especially the young ones wander through the streets in groups on foot or vehicles with various colors smeared all over them and the people in houses make merry throwing colors and water balloons at each other and also to these people on the streets.

The Swet (or white) Machhendranath festival takes place during a week each January. The image of Swet Machhendranath is bathed, oiled, perfumed and painted. The living goddess Kumari visits him at his elaborate temple near Ason Tol.

If Swet Machhendranath is pleased by the music, offerings and attentions paid by his devotees, the people of the Kathmandu Valley can look forward to satisfactory rainfall during the planting season.

This festival takes place between March/April and a grand horse parade takes place at Tundikhel. Although this festival does not have much of religious aspects, a large number of people, even from outside Kathmandu flock around Kathmandu to witness the horse race and other exciting sports activities performed by the Army in the presence of the King and the Royal family.