You would think with all the Bali Life-cycle ceremonies, the 10 day Galunggan festivities followed by Kuningan every 210 days and also all the preparations that need to take place for Nyepi day, that the year is pretty much filled with these Bali Festivals alone...
You'll be surprised...
Besides all the Bali Festivals mentioned earlier there is the Odalan, the annual temple birthday. This 'birthday' is celebrated every year according to the Wuku Calendar. So this means every 210 days.
During the Odalan celebrations will take place accompanied with many purification ceremonies.
Depending on the temple size and its importance the Odalan can attract a small crowd or even thousands of people gathering together.
For instance at the mother temple of Bali, Pura Besakih people from all over Bali come together to celebrate creating a huge colorful crowd.

Each villages has at least three temples. So in total one village alone has 5 or 6 Odalan festivals a year.
Plus...
Bali temple ceremonies can also take place according to the position of the moon: the new moon (night of complete darkness) or the new moon.
Other Bali festivals that take place throughout the island are temple festivities dedicated to specific gods.
During these days the Pemangku, temple guardian and priest for temple rituals, will invite the gods to come to the temple for a visit.
During these Bali festivals the gods will occupy the little thrones at the temple sight while the people will dance and play music all day long until the Pemangku suggest that the gods return to heaven.

It's not that difficult to spot if something important is going on at a temple. Groups of women will gather at the temple carrying high towers of fruit and flower offerings on their head.
As you can imagine ...always a beautiful sight to watch.
Foreigners who are interested in the Bali temple activities are welcome to have a look and make pictures.
However it is required to dress accordingly: long sleeves, sarong and a ceremonial sash tied around the waist.
Source : http://www.bali-travel-life.com/bali-festivals.html#Bali_Calandar_Events_-_Odalan
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