In Denpasar, precisely Kesiman Village there is an interesting ritual which is called Pengerebongan.
It's a must thing to do for visitors coming to Bali if has time to experiece a great festival.
Myself joint this ceremony already the third time, first it was eight years ago.
Because of its uniqueness and contains the mystical value, it is very recommended to witness the ritual from the beginning of the preparation until the end of the process.

Usually, this ritual is performed by people lived in Kesiman Village at a certain time but may other worshipper come from all near and far places on Bali island.