|“||Fire Night signals the official start of spring—in Prythian, as well as in the mortal world,||”|
Fire Night also called Calanmai (pronounced: cal-an-may)  is a ceremony held in Prythian which signals the start of spring. On Fire Night, various celebrations occur, including lighting bonfires, playing of drums, and the Great Rite. The crops depend upon the magic in The Great Rite on Fire Night. Each High Lord must perform The Great Rite, where they allow powerful magic to enter their bodies and seize control of them. It will cause the High Lord to attempt to find the Maiden and release magic that will spread through the lands via sex with the maiden and allow crops to grow. Many males and females gather to have sex that night as other dalliances will help the land to.
Calanmai is an annual celebration, that would have been created centuries before the events of A Court of Thorns and Roses.
Before Calamai, Feyre is ordered by Tamlin to stay in the manor and not leave. Feyre attempts to leave the manor to visit the Fire Night celebrations but is caught by a shirtless Tamlin who orders her to got to her chambers and lock the doors.
Feyre is unable to stay in her chambers as Tamlin ordered, leaving to see the Fire Night celebrations. After arriving on horseback, she sees the Fire Night celebrations, and upcoming ceremony. Unfortunately, she is noticed by three faerie who uninvitedly fondle with her as they are fascinated by a mortal in their realm. An unnamed High Fae, who later turns out to be Rhysand, jumps in to help Feyre and walks her away. He offers to escort her somewhere but she declines and he later leaves her.
Not long after, she is found by Lucien who appears to be furious at Feyre's attendance at the ceremony, even after both of his and Tamlin's warnings. He explains the events of The Great Rite to her; leading her to finally comply to return to her rooms.
Despite Lucien's second warning, Feyre decides to visit the kitchens, as she expects the ceremony to have finished. Whilst returning to her rooms, she encounters Tamlin; who is still under the influence of the Fire Night magic. He corners her against the wall, where he bites her neck, leaving a bruise.
Lucien tells Feyre that after Tamlin believed Feyre had been abducted, he refused to perform the Great Rite. Lucien took his place, taking Ianthe into the cave and performing the Rite. Ianthe had insisted it be her, blurring the line between willingness and duty, and giving Ianthe some power over Lucien and making her feel entitled to him.
When this happened in A Court of Mist and Fury, Feyre was still in the Night Court. It was at this point in the book's storyline that she accepted the mating bond between her and Rhys, and they spent the night mating in the House of Mist.
- Calan Mai is a celebration in Wales which is held on May 1st each year. Celebrations start on the evening before, known as May Eve, with bonfires; as with Calan Gaeaf or November 1, the night before is considered an Ysbrydnos or "spirit night" when spirits are out and about divination is possible . Calanmai in A Court of Thorns and Roses is a possible reference to this celebration.