Chaumasi Pakhi (Chaumasi Chaudas) is observed every four months in Jainism. The exact dates are based on the lunar calendar and can vary by local sangh calendars.

For 2025, the Chaumasi Chaudas dates that are commonly noted in Jain calendar references are:

• July 9, 2025
• November 4, 2025
• November 23, 2025

Local Jain groups in Chicago may align their observances to these dates or adjust slightly based on their own calendar. If you want the Chicago-specific dates, please check with your local Jain temple or sangh calendar (they publish the exact days for Chaumasi events in your area).