Sarvapitra Shradh / Pitra Visarjan
Sarvapitra Shradh is performed on the Amavasya (new moon) of Ashwin Krishna. If Shardh has been missed on that specific day or someone’s Shradh Tithi (date) is unknowable, Shradh can be done on the same day. At evening, Poori (fried bread) and particular dishes (Kheer, Halwa etc.) have been kept on the entrance.
It declares that ancestors should not go hungry and in the same way lighting signifies shining their way of ancestors. Ashwini Amawasya is also known as Pitra Visarjan. By donating extensive meal to the brahmans, ancestors are being contented on this day. It is a faith that at the time of Visarjan, sons are blessed by their ancestors.
The last day of Pitru Paksha is known as Sarvapitri Amavasya or Mahalaya Amavasya or Ashwin Amavasya. Mahalaya amavasya is the most significant day of Pitru Paksha.