The Gratitude Festival was an annual holiday of great importance to the Bajoran people. Also known as the Peldor Festival, it dated as far back as 17600 BCE.
The traditional greeting during the festival was "Peldor joi". Bateret leaves were traditionally burned, and participants wrote their problems on renewal scrolls which were then burned so that their troubles symbolically turned to ashes.
The logo seen on banners and flags during DS9: "Fascination" advertising the Festival incorporated parts of the logo seen on the uniforms of the medical personnel on Tantalus V and Elba II, namely the sun and the characteristic hand.