Twelth Day of Pitrupaksha, Twelth Day of Mahalaya Paksha, Twelth Day of Shraddha, Dwadashi Shraddha, Baras Shraddha
The twelfth day of the waning part or phase of the moon in the month of Bhadrapada or Dwadashi Thiti of the Krishna Paksha Bhadrapada month of the lunar calender is Dwadashi Shraddha or Baras Shraddha. According to North Indian Purnimant Calenders, Dwadashi Shraddha falls in the month of Ashwin.
Dwadashi Shraddha is the twelfth day of the fifteen auspicious days which are known are Mahalaya Paksha. Shraddha is performed for the ancestors who have died on the Dwadashi Thiti. The paksha is not considered and only Thithi is the deciding factor.
On Dwadashi Shraddha, Shraddha for the sages i.e people who have renounced worldly pleasures and other worldly things is performed.In the process of Shraddha, Tarpan and Pinda Daan are offered to the ancestors. Pinda are then immersed in a river or if no river is there then they are fed to a cow. It is believed that the ancestors would stand in front of the house during the Aparahna time of the thithi and performing the Shraddha would please them. Therefore care should be taken that lunch during the Shraddha should happen at Aparahna time of the day which would be around 1-2PM.