Maha Navami 2026: Is It On October 19 Or 20? Date, Tithi Timings, Puja Vidhi And Fasting Rules. Maha Navami 2026 will be observed on October 19, with Bengali Durga Puja marking it on October 20. Check the Navami Tithi timings, puja rituals, fasting rules and Sandhi Puja details.