 Each year in the Islamic month of Muharram, Ponorogo holds a celebration known as "Grebeg Suro", "the party of the people".Grebeg Suro involves many traditional events such as the National Reog Festival, the Heritage Carnival and the Larungan Proceedings of Prayer held at Lake Ngebel.On 11 August, the anniversary of the founding of the Ponorogo Regency is celebrated.