Gadaa is the indigenous democratic system of governance used by the Oromos in Ethiopia and northern Kenya. It is also practiced by the Konso and Gedeo people of southern Ethiopia. The system regulates political, economic, social and religious activities of the community.

Irreecha, is thanksgiving holiday celebrating the end of the winter in Oromia Region, Ethiopia. The Oromo people celebrate Irreecha to thank Waaqa (God) for the blessings and mercies they have received throughout the previous year. The Irreecha festival is celebrated every year at the beginning of Birraa (Spring), new season after the dark and rainy winter season. It is attended by hundreds of thousands people. The thanksgiving is celebrated at sacred lakes across Oromia Region like the Hora Finfinne and Hora Harsadi, Bishoftu, Oromia Region as a whole. Once at the lake, festival-goers immerse freshly cut green grass and the flowers they are carrying and sprinkle themselves and place in water.