Ogoh-ogoh festival is held 1 day before nyepi day, it is not just bring the models of demon then burn them. It's more. Ogoh-ogoh is a parade, ritual, competition and communal pride. This is a annual event. It's held every Nyepi day, one day before Nyepi. They made the representation of the demon, any kind of demons. Bring them around then burn them at the end of the parade.