Within Shingon, what most clearly marks the tradition as esoteric is the way ritual, mandala, and devotion to particular figures interweave into distinctive festivals and ceremonies. At the heart of this ritual world stands the Goma (Homa) fire offering, performed frequently and often serving as the centerpiece of major observances. In this rite, consecrated fire is invoked—especially in connection with Fudō Myōō—to burn away karmic obstacles and support the fulfillment of vows, with offerings cast into the flames as a concrete expression of inner aspiration. Many temple festivals, memorial days, and even seasonal observances are shaped around this fire ritual, giving Shingon temple life a characteristic atmosphere of transformative intensity.

Equally distinctive is the network of ceremonies centered on Kōbō Daishi (Kūkai), whose presence permeates Shingon devotional life. Temples celebrate his birth with Gōtan‑e, marked by processions, special Goma, and the chanting of hymns in his praise. His entry into eternal samādhi is commemorated in Shōryō‑e or Mieku‑e, especially at Kōyasan’s Okunoin, where all‑night rites and lantern processions express the conviction that he remains spiritually present. Monthly observances on the twenty‑first, often taking the form of temple fairs or markets (Kōbō‑ichi), further embed his veneration into the rhythm of the calendar, so that the founder’s memory becomes a living, recurring festival.

Shingon’s mandala‑based ceremonies give visible form to its doctrinal vision. Rituals such as Ryōkai Hōyō invoke both the Womb Realm (Taizōkai) and Diamond Realm (Kongōkai) mandalas, drawing on their deities, mantras, and symbolic layouts to enact the unity of compassion and wisdom. The consecration of images and mandalas through Kaigen‑hō “opens the eyes” of statues and paintings so that the deities are ritually invited to dwell within them, using mudrā, mantra, and often Goma in a distinctly esoteric pattern. Initiatory rites such as Denbō‑e and Kanjo (Abhiṣeka) place practitioners before these mandalas, ritually “sprinkling” them and transmitting mantras and visualizations, thereby linking them to specific deities and practices in a way that is both ceremonial and deeply interior.

Meditative and doctrinal emphases also take on ceremonial form in Shingon temples. Ajikan practices, for instance, are not merely private meditations but can be conducted as formal group rites centered on the visualization of the Sanskrit letter “A,” representing Mahāvairocana and the Womb Realm. Some temples hold Taizō‑e and Kongō‑e, festivals that highlight, respectively, the compassionate source‑aspect and the wisdom‑aspect of Mahāvairocana as depicted in the two great mandalas. Fudō‑e observances, especially at major Fudō halls, gather large numbers of devotees around powerful Goma rites, with the deity’s sword and rope symbolizing the cutting of delusion and the binding of wayward passions. Even widely shared observances such as Obon, Segaki, Higan, and New Year take on a particular Shingon flavor through the use of its mantras, mandalas, and fire rituals, so that the esoteric vision quietly permeates the full cycle of temple life.