Maha Navami 2025 is on October 1, with Navami Tithi from 6:06 pm on Sept 30 to 7:01 pm on Oct 1. While most states follow Purva-Viddha rules, Bengal observes Para-Viddha rituals separately. Key practices include Mahasnan, Shodashopachar Puja, Chandi Path, Balidan, Homa-Yajna, and Anjali, blending devotion, cultural programs, and community celebrations.