The Jain festival where married women fast for the well‑being and longevity of their husbands is Ayambil Oli (Navpad Ayambil Oli).

• What it is: A two‑times‑a‑year, nine‑day spiritual observance. Each day includes ayambil fasting (one plain meal a day, without taste), plus Navapad/Siddhachakra worship, study, and related prayers. The focus is on purifying passions, strengthening right faith, knowledge, and conduct, and fostering family well‑being, especially for the husband. Digambar and Śvetāmbar traditions both honor Navpad Ayambil Oli, with small ritual/narrative differences, but the core purpose remains the same. You can read more here .

• When it happens: It is observed twice a year, during the Chaitra and Ashwin (Āshwin) lunar fortnights. The exact start and end dates vary by local calendar, but it runs for 9 days each time. For example, in 2025 Ashwin Oli is roughly Sep 29 to Oct 7, though local sanghs may differ by a day. You can read more here .

• What you do (summary):

- Ekāsan (one sitting for the day) and ayambil (plain, tasteless food: no oil, dairy, sugar, spices; water usually boiled and limited to daylight). - Navapad/Navchakra worship, samayik, pratikraman, svadhyaya, and charitable acts.

• Digambar vs. Śvetāmbar notes: Both traditions observe Navpad Oli, but the liturgical emphasis may differ slightly (Śvetāmbar often centers on Siddhachakra/Navpad Puja; Digambar emphasizes Navapad aradhana). The spiritual aim—self‑restraint, detachment from taste, and family wellbeing—remains the same. You can read more here .

If you’d like, I can help you find the exact dates for your local sangh for this year.