We missed the annual śrāddha this year. What should we do now?

do it on the next Amāvasyā or in Pitṛ Pakṣa with a sincere prayer; there is no curse for an honest lapse.

Illness, travel, a birth or a death in the family, or simply forgetting — these happen. The tradition expects them and gives a way forward. Many priests advise doing the missed śrāddha on the next Amāvasyā (new moon), which is dedicated to the ancestors every month. Pitṛ Pakṣa, and especially Sarvapitṛ Amāvasyā, is also meant for any śrāddha that could not be done on its own day.

When you do it, simply tell your ancestors in your heart that it was missed and that you are offering it now with love. Some families add a little extra dāna or feed one more person.

Ancestors are remembered as elders who loved us, not as beings waiting to punish. Missing once does not undo years of devotion. Make a reminder for next year, and move on without fear. If your situation is specific, Ask Chiluka.

Source: Nirṇayasindhu; common practice · Amāvasyā is the monthly day for ancestors

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