Hindus in Bali apply strict rules regarding temples and ceremonies. These rules mainly concern dress requirements and conditions of 'sebel' (taboo) such as menstruation or open wounds, bringing food into the temple, being physically or mentally ill, being in a state of mourning (for the Balinese this lasts 42 days), and having given birth within the past 42 days. Other rules need to be observed or asked for, especially during festivals.
Simple guidance when attending a Temple Ceremony as follows:
• Always wear a sarong and sash.
• Do not walk in front of people when they are praying.
• Do not use flash or point your camera at the priest's face!
• Never sit higher than the priest or the offerings.
• During cremation ceremonies, do not get in the way of attendees, however perfect that photographic moment might be.
• Women are not allowed to enter temples during their menstruation.
If you are not sure but desperately want to see the ceremonies at the temple, ask local people or your travel guide for assistance on what to prepare for visiting.