Garmin Connect Calendar is a pretty neat feature where it allows you to plan your workouts days, weeks, or months ahead. However it does not come with a good sharing feature as you will have to download the calendar in order to share it with others.
This is where Google Calendar comes handy.
Download Garmin Calendar
To download Garmin Calendar click on the top right icon which offers two options; Send Workouts to Device and Publish Calendar. Choose Publish Calendar.
You will be provided with a link to share the calendar
Once you visit the URL you will be able to download your Garmin Calendar. You can choose to share the URL with others however they will need applications such as Microsoft Outlook or Google Calendar to view it. In this case I prefer to upload it to Google Calendar so that others will not have to remember the URL to the calendar.
Import Into Google Calendar
In Google Calendar, go to Settings icon on the top right and choose Settings. This will take you to Calendar Settings page. Click on Calendars tab.
Click on the option Import calendar and choose the file to be imported and which Google Calendar to be used.
Once everything is ready click on Import. Once done you will be able to see the calendar in the main page.
One last thing to do is to set the calendar to public or to assign which emails are able to view the calendar. This can be done in the calendar settings.