Chaturmas in Jain Dharma is the four-month monsoon period when Jain monks and nuns observe vows more strictly and lay followers practice intensified seva, fasting, and study. It typically begins with the onset of the rains and ends after the monsoon season, though the exact dates shift each year.

In Mumbai, you’ll commonly find:

• Temples and Jain organizations (sanghs) organizing Chaturmas programs, discourses, and bhajans.
• Community gatherings where lay followers perform charitable seva, provide bhikhsha (alms) to monks, and observe stricter dietary rules during the period.
• Special pujas and discourses at major Jain centers, with locale-specific schedules posted by the temple committees.

If you’re planning to participate or attend:

• Check with your local Jain temple or sangh in Mumbai for their Chaturmas calendar and registration requirements.
• They can tell you about any temple-specific rules (for example, restrictions on certain foods or on personal travel during the observance) and the exact start/end dates for the year you’re interested in.

For authentic Jain context and practices, you can explore more on JainKnowledge.com pages about Chaturmas and related observances.