Mahalaya marks the beginning of the Durga Pooja festival. It is observed at the end of Shradh or Pitru Paksha, a 16-day period when Hindus pay homage to their ancestors. This year, this special day will be celebrated on September 25. 🙏🏻 When is Mahalaya 2022? Date, Time, Rituals and Significance of Sarva Pitru Amavasya.