Tripindi Shradha is an offering in the memory of the dear departed. If for three consecutive years the offerings are not made to the dear departed then the dead gets vehement, so to calm them these offerings are made.
One month of humans equals one day for the dead. The day of new moon is the lunar day for the dead. On this day Darsha Shradha is performed. Unsatisfied dead harasses in the form of demon. Cancellation of rites meant for the forefathers, denying offerings made in the memory of the dear departed and spiritual procedures if not performed as per the traditions then problems may arise from goblin, corpse, demi-gods, the 27'th lunar mansions and may led to religious discord. Such tribulations may occur intermittently and may span in a period of one day, three days or fifteen days. It may also lead to delay in marriage prospects, failure in business, receding prosperity day after day. Tripindi Shradha must be performed to resolve such calamities. Its assertion is mentioned in "Shradha Chintamani".
This rite can be performed on the important months like 5th, 8th, 9th, 10th, 11th, 12th and 2nd month of the Hindu calendar and on 5th, 8th, 11th, 13th, 14th, 30th in the dark half of the lunar month is the lunar day or Sunday. But if fierce-day agony is experienced then Tripindi Shradha must be performed immediately. This measure is mentioned in "Godayatra Viveka-Darsha".
In this religious act of oblation to the dear departed, 'Yekechiprapene pindayente cha maheshwar' affirmation is mentioned. Kalidas has mentioned in his Raghuvansh MahaKavya (epic) ' Maheshwara Trambak yeva napparha'. After all maheshwar Sanghya is meant for Trimbakeshwar. 'Hey Maheshwara, (Trambak) whoever is harassing us in the form of demon destroy them all' is my prayer to you. Dead in the form of demon Ravi when it is positioned between Kanya (Virgo) and Tula (Libra) they attack on earth. This is a very important and right phase and time for offerings to the departed. By performing this Kaam Shradha (Offerings) one is liberated from the demons. Do not perform this Kaam Shradha during the festivity of Navratra. Also do not perform Tripindi Shradha and Tirtha Shradha on the same day. Perform it on different days but if you are short of time then firstly perform the Tripindi Shradha and then perform the Tirtha Shradha.
This religious act should be performed at a holy place meant for demon liberation or sacrifice. Brahma, Vishnu and Mahesh are the main Gods in this rite. Of the two kinds, from the earth, from the sky and spirit, virtue, particle, irascible also infant, young and old dead in all stages are oppressed with vehement emotions. In the end one must perform Tripindi Shradha as per the tradition and conventions. Before this rite it is necessary to undertake holy dip in Ganga for expiation and body purification. Here Skhaur is not necessary. As Shakhur is innate part of expiation, Tripindi rite is to be performed accompanied by wife. One can perform this rite even if you are single or a widower. In this God Brahma (Silver), Vishnu (Gold), Rudra (Copper) are omnipresent.