Diwali for Jains is mainly the day of Mahavira’s nirvana (moksha). It is a time for remembrance of his teachings—truth, non-violence, and self-discipline—and for spiritual renewal.

Key points:

• The day: Diwali is observed on Kartik Amavasya (the new moon night in the Kartik month). In 2025, the main Jain Diwali day is October 20; some local calendars note an Amavasya span that could extend to October 21, but most sanghs mark October 20 as the Diwali day.
• Why it is celebrated: to honor Mahavira’s nirvana and to reflect on his guidance for right conduct and inner purity.
• Common practices: lighting lamps (diyas) in homes and temples; prayers and readings from Jain scriptures; recitations honoring Mahavira; fasting or days of restraint; charitable acts; and avoiding firecrackers out of ahimsa (non-violence) toward living beings. Some Jains also visit Pawapuri or Nalanda to extend prayers.
• Varied emphasis: Digambar and Śvetāmbār communities share the core meaning, but there can be small differences in observed rituals or fasting practices. Some Śvetāmbār calendars emphasize a two-day observance around the amavasya; many followers, however, focus on the single main day.

You can read more here

If you’d like, I can summarize how a local Jain temple near you marks Diwali or list specific stotras or prayers commonly recited on this occasion.