Karva Chauth is not a Jain festival. It is a Hindu tradition observed mainly by married women who fast from sunrise to moonrise for the long life and well‑being of their husbands, often with rituals, sargi, and moon‑gazing.

In Jain families:

• There is no Jain scriptural basis or official Jain ritual called Karva Chauth.
• Some families may participate in this day as a family or cultural practice, but it is kept as a family tradition rather than as part of Jain dharma.
• Jainism emphasizes self‑control, compassion, non‑violence, and spiritual progress. Fasts in Jain practice are generally tied to Jain vows (like equanimity, tapasya, or specific tirthankar pujas) and are focused on one’s own spiritual purification rather than on the longevity of a spouse.

If you’re looking for Jain‑specific alternatives for a similar spirit of devotion and discipline (without Hindu festival elements), you might consider:

• Observing a personal vrata (fast) with a clear aim for spiritual growth or for blessings to loved ones, within Jain ethical guidelines.
• Participating in auspicious Jain observances and pujas that honor the Tirthankaras, or performing dana (charity) and ahimsa‑driven acts as a daily practice.
• Reading or reciting Jain stotras or sutras that align with devotion to right conduct and renunciation.

If you’d like, tell me which Jain tradition you follow (Digambar or Śvetāmbara) and I can share a simple Jain practice or prayer that fits your context.