13th August - Full Moon - Purnama Sasih Karo
The full moon falls on this dayand ceremonies are held throughout the Hindu temples all across Bali. The Balinese that adhere to the Hindu Dharma religion will take offerings of food, fruit and flowers to the temple to be blesses by the priest.
17th August - Independence Day
This is a national public holiday; therefore banks and government buildings will be closed, as will be a large amount of commerce. After the flag hoisting at the National Palace, and a display of marching from military to children to adult; neighborhoods prepare for fun and games for the kids.
20th August - Hari Tumpek Krulut
Tumpek Krulut Day is dedicated to all musical instruments, masks and other instruments used in art performances and the numerous religious ceremonies in Bali.
28th August - Dark Moon - Tilem Sasih Karo
The Balinese adhering to the Hindu Dharma religion will celebrate 'Tilem' in temple ceremonies, which are mostly held in every major temple and family shrines around the island of Bali. On this day Hindus make offerings to the Gods, placed on the ground at the entrance of each housing compound. The aim is to beg God's grace; so that one's dark thoughts will be illuminated by Him.
30-31th August - Hari Raya Idul Fitri
Ramadhan or fasting month is a very special month to Moslems throughout the world. During the month all Moslems will try to be holy (body&soul) by avoiding wrongdoing to God or to others. Most will spend their leisure time by reading the Al-Qur'an, praying and doing charity work. Fasting starts before sunrise at about 5am and finishes at sunset at about 7pm.
Source: Baliplus.com