The New Moon Celebration was an annual festival held between the Northern and Southern Water Tribes during the antebellum period before the Hundred Year War. It was a commemoration held to reunite the two polar Water Tribes. Considering Avatar Kuruk's allegory while talking to Aang in the Spirit World, the celebrations were seemingly scheduled to correspond with a new moon. It was at one of these festivals that Kuruk met the love of his life, Ummi, sometime prior to 312 BG.