After 19 years Sawan will be celebrated for two months, which according to the Hindu calender is known as the Adhik Sawan Maas. Here are some of the fasting rituals and rules to follow during the holy month of Sawan.After 19 years Sawan will be celebrated for two months, which according to the Hindu calender is known as the Adhik Sawan Maas. Here are some of the fasting rituals and rules to follow during the holy month of Sawan.