Ryōbu Shinto, also known as Shingon Shinto, is a syncretic mix of Shinto and Buddhism that emerged in Japan during the 9th century. As a result of this fusion, Ryōbu Shinto incorporates elements from both religions, including rituals, beliefs, and practices. This syncretic form of Shinto has its own unique set of festivals and holidays that are celebrated by its followers.

One of the most important festivals in Ryōbu Shinto is the Goma Ritual, also known as the Fire Ritual. This ritual is derived from Buddhism and is believed to have the power to purify and protect individuals from negative influences. The ritual involves offering prayers and offerings to the deities while a fire is lit and maintained throughout the ceremony. It is usually performed by Shingon Buddhist priests, who are also trained in Shinto practices.

Another significant festival in Ryōbu Shinto is the O-Bon Festival, which is celebrated in the summer to honor and remember ancestors. This festival is a combination of Buddhist and Shinto traditions, where families gather to clean and decorate the graves of their ancestors, offer food and incense, and perform rituals to guide the spirits of their ancestors back to the spirit world.

In addition to these major festivals, Ryōbu Shinto also celebrates various other holidays throughout the year, including the New Year's Festival, Setsubun (the bean-throwing festival), and the Cherry Blossom Festival. These holidays often incorporate elements from both Shinto and Buddhism, such as purification rituals, prayers, and offerings to the deities.

One unique aspect of Ryōbu Shinto is the celebration of the Five Mountain Festivals, also known as Goshintai-sai. These festivals are held every year in the five sacred mountains of Japan, which are believed to be the dwelling places of the deities. During these festivals, followers of Ryōbu Shinto make pilgrimages to these mountains to pay their respects to the deities and seek blessings for health, prosperity, and protection.

In conclusion, Ryōbu Shinto has a rich and diverse set of festivals and holidays that reflect the syncretic nature of this religion. These celebrations not only bring together elements of Shinto and Buddhism but also serve as important cultural and spiritual events for followers of Ryōbu Shinto.