The biggest ritual festival of the Tenggerese is known as the Yadnya Kasada. Yadnya is the Javanese version of the Sankskrit word “yajña” (meaning fire ceremony in the month of Kasada).
On this occasion, Tenggerese people go to the mountain and ask for the blessings of the highest deity in the cosmos, locally known as Hyang Widi Wasa, and also from Mahadeva (= Shiva), the god of the mountain itself.