Meskel (the founding of the true cross) is an intangible heritage that commemorates the discovery of the true cross celebrated annually on September 26, and 27 in Ethiopia. It is an amazing (religious) festival that I recommend everyone to visit, experience and be part of.
More on this can be found here:
http://www.ena.gov.et/en/index.php/component/k2/item/2002-meskel-ethiopia-s-intangible-heritage
https://www.youtube.com/watch?v=LFFzLgiv0jo