Internet services on Bali will go dark this Saturday, with providers switching off mobile services for 24 hours to mark the Indonesian island’s annual day of silence.

Nyepi, or New Year according to the ancient Balinese calendar, is a sacred day of reflection on the Hindu-majority island. Even the international airport shuts down.
https://www.theguardian.com/world/2018/mar/15/bali-switches-off-internet-services-24-hours-new-year