Because the religions, whether the aboriginal Bon religion, or the later introduced but predominant Tibetan Buddhism, are so deeply rooted and ubiquitous in Tibet, there are many religious festivals, which were initially only celebrated by the clergy, and later on jointly celebrated by both the clergy and the laity, such as the aforesaid Bathing Week, Ongkor Festival, Shoton Festival and Buddha Painting Unfolding Festival and so on. Even those gradually secularized festivals still keep, more or less, their religious ties, which can be seen from their stylized rituals. Take the time-honored and deities-worshiping Bon religion, and its ties in some festivals as an example. The festivals: Maidug Dancing Festival, Farm-yak Training Festival, Yak King Festival, Leyehe Festival, Consecrating Mountain God Festival, Shouting to Mountain Festival, Deity Befalling Festival, Dedo Festival, Consecrating Dragon Festival and so on, all have their own stylized rituals respectively for consecrating different deities or for praying for a happy life.

Among all the Deity Befalling Festival in the Gongbo region is most famous, which is celebrated on the 10th day of the eighth Tibetan month of every Tibetan Horse year, i. e. once every 12 years. It is worshiping a legendary gem deity for good fortune. In addition, a 'Bird Coming Festival'is also worth mentioning, it is for welcoming the cuckoo bird, the king of birds in Tibetan legend, which comes back in spring every year. The most interesting one is Consecrating the Mountain God Festival, also known as Erecting Arrow Festival, which is for different tribes to celebrate their own respective mountain god. For example, the one in Amdo county of Nagqu Prefecture is celebrated on the 15th day of the sixth Tibetan month, for which men are gathered at the foot of their sacred mountain one day before. Then on the next day, all the people climb to the top of the mountain and jointly erect an arrow of over 10 meters high in the center, and respectively erect numerous arrows of about 6 meters high around it. Its might originate from the yearning of their war-ridden ancestors for military power.

However, most of religious festivals belong to Tibetan Buddhism. They are distributed in ever month of a year and are diversified in different sects and monasteries. For example, the most important grand ceremonies and festivals of the Gelug Sect are: the Great Prayer Festival in the first Tibetan month, the Small Prayer Festival in the second, the Tsongkapa Butter Lamp Festival in the tenth and the Divinity Dancing Festival in the Potala Palace in the twelfth. Those of the Sakya Sect are: the New Year Holy Dancing Festival, Gor Guardian Deity Dancing Festival, Nirvana Day of Sakyamuni, Buddha and Wrathful Vajra Holy dancing Festival, and so on. In addition, the Nyingma Sect and Gagyu Sect also have their own ceremonies and festivals. Some monasteries also have their unique festivals, such as, the Incense Festival in Tsangdain Monastery, Quton Festival in the Quton Monastery, Unfolding Buddha Painting Festival in the Tashilunpo Monastery, the Punje Festival in the Sera Monastery, the Paltung Tanbo Festival in the Razheng Monastery, and the Qonggyu Festival in the Drepung Monastery and so on .