-  1. Open Google Calendar in your browser 
 -  2. Click the settings gear icon next to your calendar 
 -  3. Select "Settings and sharing" 
 -  4. Scroll down to "Access permissions" section 
 -  5. Copy the "Public URL to this calendar" link 
 -  6. Paste the link in the "Calendar link" field 
 
Example:https://calendar.google.com/calendar/embed?src=example@gmail.com