The New Year festival, called "Losar", is perhaps the most important festival of Tawang District in Arunachal Pradesh. The Losar festival of the Monpas is their new year of festival. On this occasion people clean out their homes to usher in the new year and to discard the old. It mostly falls in the last part of February or early part of March and is celebrated with lots of fun and festivity, which lasts for about 8 to 15 days.

Reh is one of the most important festivals of the Idus. The Idus believe that they are the sons and daughters of the divine mother 'Nanyi Inyitaya'. But none can get her blessings and keep alive bond of brotherhood and social feeling strong, unless one performs the puja or celebrate the Reh festival. But it is so expensive that only a few people can afford to celebrate the festival for propitiation of the supreme creator, the great mother 'Nanyi Inyitaya'.

Festivals is one of the essential aspect of the socio-cultural life of the people of Arunachal Pradesh. The festivals showcases the culture of the people. As agricultural is the mainstay of the people, the festivals that are celebrated by the people reflect this occupation. The Ojiyale festival, Arunachal Pradesh is one of the festivals among these. The wanchos celebrate their popular festival, The Ojiyale festival, during March-April, for a period of six to 21 days.

Another important festival is Tamladu, essentially celebrated by the Digaru Mishmis tribe. During the festival, prayers are offered to the God of Earth and the God of Water for protection against natural calamities. The supreme - Lord Jebmalu, is worshipped and welfare of human beings, the standing crops and domestic animals.

Another festival is the Khan festival, an occasion for the reunion of the people. Besides the usual festivities, the significance of the festival lies in the ceremony whereby the priest ties a piece of wool around everybody's neck. The belief is that the enchanted thread will bring good luck to each of them.

Sangken festival, is an occasion to bathe the images of Lord Buddha ceremoniously. This also heralds the new year and people sprinkle water on each other as a sign of merriment.

Monpas have a colourful festive heritage. The festivals are related with agricultural practices and religious events.