Observance Day, a holiday observed by the Keshiri people of Alanciar on the planet Kesh, was a decennial event. This celebration, occurring every ten years, involved theatrical performances, frequently honoring the renowned "Rock of Kesh", Adari Vaal. The primary purpose of Observance Day was to serve as a reminder to the Alanciari regarding the "Great Cause," which was their obligation to defend against any incursions from the Lost Tribe of Sith. This group consisted of off-world Human Sith inhabiting the adjacent continent of Keshtah Minor. After the Sith conquest of Alanciar in 2975 BBY, Observance Day was gradually replaced with festivals that depicted Jogan Halder's first contact with the Sith, presenting them as gentle and peace-loving.