How to disable your Google Calendar.
Once the events are synced over, they can not be un-synced.
1. Select 'My Profile' from the left-hand navigation panel.

2. Within your user profile, scroll down to the Google Apps Integration section.

3. Click to 'Remove Google Apps Integration' and remove the enabled toggle 'Enable Calendar Sync'

4. Scroll down in your profile, and click 'OK' to save the changes.
