In Jainism, the most auspicious annual period is Paryushan Parva. During this time Jains focus on self-purification through fasting, meditation, study of scriptures, and seeking forgiveness (micchami dukkadam). The practices and exact length vary a bit between Śvetāmbara and Digambara communities, but the essence—intense spiritual reflection during a dedicated holy period—remains the same.

• Śvetāmbara tradition: Paryushan Parva is observed in the month of Shravana/Bhadrapada (the exact dates move with the lunar calendar) and is followed by the Samvatsari, the day of forgiveness.
• Digambara tradition: Paryushan Parva is also observed, but the schedule and some ritual details can differ; the period is treated as the principal time for purification and communion with the Jain scriptures and teachers.

Other highly auspicious occasions in Jainism include:

• Mahavir Jayanti: Birthday of Lord Mahavir, celebrated with devotion and processions.
• Mahavir Nirvan Day (Diwali in many communities): Commemoration of Mahavir's Nirvana.
• Various tirthankar and temple-specific festivals, which are especially sacred in their local contexts.

If you’d like, I can give you the exact dates for the current year and break down the observances for Śvetāmbara and Digambara communities.