It is a ritual traditional event by performing wayang puppets with the story of Murwakala, with purpose to live safely & happily. 
Batara Kala, a bad son of god Guru, who was entitled to eat human-beings in the list of Sukerta. Sukerta or Sukarta means a decent deed or to be loved.
The Ruwatan has been performed very sacredly, the court family has been prepared to be in a holy state mentally and physically. All guests were required to wear complete Javanese dress, has to remain solemn and not allowed to eat, drink and smoke during the ceremony.
