Gatari Amavasi is observed on the Amavasya, or no moon day, in the month of Ashada as per Marathi calendar in
Maharashtra. The next month is the Shravan month and many people give up drinking liquor and non-vegetarian food for the next 40 days. Amavas is the last day in a traditional Marathi month. In 2017, the date of Gatari Amavasi is July 23.
Since most people will not eat non-vegetarian food and do not indulge in drinking Shravan month, many people make full use of the last day in Ashada month, which is the Gatari Amavasi. Some people drink through the night of Gatari with friends and relatives.
The reason Maharashtrians abstain from different types of food in Shravan month is that, monsoon is at its peak and it is considered the period at which the stomach is most susceptible to different ailments. So because people have to control indulgences in Shravan month, they indulge the day before Shravan month in excessive drinking and eating.
In the Sawan, or Sravana month, devout Hindus observe different pujas, Vratas and fasts. Some only eat only a single meal either at night or during daytime. Therefore on the last day of Ashada month, Gatari Amavas, people eat all type of foods including non-vegetarian meals.
This Amavasi is observed as Hariyali Amavas in North India and