From Wikipedia

Mehlella (Ge'ez: ምህልላ, Hebrew: "מֶהֶללַה"‎; "Supplication") also Amata Saww (ዐመተ ሰወ; "עמתה סו"; "Grouping Day") or in its popular name Sigd (ሰግድ, "סיגד"; "Worship") is one of the unique holidays of Beta Israel community. Celebrated on the 29th of [the Hebrew month of] Cheshvan.
Previously, Sigd was celebrated on the 29th of Kislev, and after a calendar reform it was moved to its present day, 50 days after Yom Kippur.Originally Sigd was another name for Yom Kippur and after the reform that reunited them, the holiday was called by its present name.

There are two oral traditions on the origin of Sigd. One tradition traces it to the 6th century in the time of the Aksumite king Gebre Mesqel when the war between Jews and Christians ended and both communities separated from each other.The second tradition traces it to the 15th Century as a result of persecution by Ethiopian-Christian Emperors. The first mention of Sigd is from the 15th century.

jerusalem , armon hanatziv , armon , hanatziv , Ethiopian , Holiday , festival ,