To unsubscribe and remove the events from your google calendar on your Android device, you must unsubscribe via your laptop or desktop.  You cannot unsubscribe from your Android phone.

• Step 1: Open your Google Calendar
  
• Step 2: Under My Calendars, click the three dots of the calendar subscription you want removed
• Step 3: Select Settings & Sharing
• Step 4: Click Delete in the left hand menu or scroll to the bottom of the page and click the Delete button.
• Step 5: Confirm removal of subscription

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• If you wish to revoke ECAL access forever, click here
• Seamlessly add or remove schedules and publishers to personalise your calendar experience from the Manage My ECAL portal.