Right time to do Sarva Pitru shraddh, Mahalaya Amavasya..
According to Hinduism, Sarva Pitru Paksha can be conducted in the form of Shraddh during the Krishna Paksha of Ashwin Month.
It is to be noted that Shraddh Paksha is also known as Mahalaya Amavasya. In Maharashtra, it is locally known as Pitra Pandharvada. In Tamil Nadu, it is celebrated as Addi Amavasyi and in Kerala, it is also known as Karikada. The description of Shraddh Sanskar is mentioned in many holy Hindu religious texts and inscriptions.
It is to be remembered that Shraddh means to do ceremonies for all the departed souls of dead forefathers so they can largely attain peace and wholehearted rest. It is the perfect ceremony to offer reverence to god, ancestors, family and children. It is to be highly noted that the soul of the dead forefathers of a family after death resides in the Pitra Lok, it is a place between the heaven and the earth. During the time of Shraddh Paksha or Pitra Paksha, they visit the earth in order to meet the family members. The ceremonies and Tarpan conducted on the Amavasya is known as Shraddh.
Locally Mahalaya is also called as Shraddha. According to the Sanskrit language, the Mahalaya, Maha means “day of festival” and alaya means “home”. On the day of Krishna Paksha, the forefathers visit the earth so if Shraddh is not done they they might go back to unhappily to Pitralok. It is done for the peaceful salvation of forefathers. On Sarva Pitru Amavasya is a day when those who doesn’t know the date of death of their forefathers can also do it.