Police and traditional Balinese security personnel, wearing sarongs and armed with daggers, will be out in force on the Hindu-majority island as the beauty queens take to the stage.
A total of 129 contestants will parade in the glittering finale of the three-week event, which will be broadcast to more than 180 countries.
But protests by Islamic radicals in Indonesia, the world's most populous Muslim-majority country, have overshadowed the contest and prompted authorities to order the whole event be moved to Bali, where hardliners have little influence.
"We are going to protest against it, because it is unacceptable," said Haidar Al-Hamid, head of the East Java province branch of the Islamic Defenders Front (FPI).From a panel of judges before a winner is crowned.