The celebration of Si-Donyi is praised by one of the real clans of Arunachal Pradesh known as Tagin. Celebrated in the long stretch of January consistently, this celebration denotes the start of another year. The celebration is watched for the prosperity of the group and humanity all in all. Tagins are the tenants of Upper Subansari and can likewise be found in West Siang area. The term Si-Dyoni originates from two words 'Si,' which implies earth; and 'Dyoni,' which implies earth. In this way, clearly amid the celebration, the sun and earth are revered alongside different divinities and forfeit of two Mithuns Gayal are led with the warding off of the detestable soul.
The devout cleric, Nyibu present certain songs known as 'Uyu Barman' that calls the soul who is in charge of causing the issue. Offering of a white chicken, which can be of any sexual orientation is made to 'Nonyi' on the pinnacle of a high shaft in a function known as 'Donyi Meli Pinam.' Then sharing the meat of the relinquished Mithun is done among the general population. Likewise, musical moves, for example, Chungne, Riabu, Takar Ghene and customary society moves like Konyi Bokar and Hoyi Penam are additionally performed in the festival to satisfy the Si Donyi.