Why is Mahalaya linked with both ancestors and Goddess Durga? Understand the connection between Pitru Paksha, Mahalaya Amavasya, and Devi Paksha. Mahalaya 2026 will be observed on Saturday, October 10, with Sarva Pitru Amavasya marking the end of Pitru Paksha. The day holds special importance in the Hindu calendar because it marks the transition from a period dedicated to ancestors to the beginning of Devi Paksha.