Yangchen's Festival

Yangchen's Festival was a celebration held by the Air Nomads to honor Avatar Yangchen. Despite having been recognized in the past as one of the nation's most symbolic holidays, observances ceased following the genocide that eliminated the majority of the Air Nomad race. Shortly after the end of the Hundred Year War, Avatar Aang made efforts to reinstitute the festivities with the help of Team Avatar.

Purpose
Due to Avatar Yangchen's devotion to her duty as the Avatar, no threats of war occurred for an entire generation following her death around 345 BSC. As a result of this, she was highly respected by her people, so much that two statues were erected in her honor in both the Eastern and Western Air Temples. The Air Nomads also immortalized her achievements by declaring a festival in her name, which eventually became to be considered as one of the nation's most sacred celebrations.

Graphic novel trilogies

 * The Rift

Trivia

 * Yangchen's Festival is the only known holiday that the Air Nomads celebrated.