The System Preferences window in macOS Monterey.

4. From the right pane (Figure 2), click Google.

The Internet Accounts window makes it easy to add several different account types.

5. You will then be prompted to okay the opening of your default web browser. 

6. Click Open Browser, and Safari (if it's your default) will open to the Google account authentication wizard (Figure 3). 

You must sign in with your Google account before you can continue.

7. Once you've added the account, you can then configure which elements are added (from Mail, Calendar, Contacts, and Notes -Figure 4).

My Google account has been successfully added.

Make sure Calendar is enabled and the next time you open iCalendar your events from Google Calendar will populate. This configuration gives you read/write access to Google Calendar from iCalendar.

Adding iCalendar to Google Calendar

There are two caveats to adding a calendar from Apple's iCalendar to Google Calendar. The first is the iCalendar to be added must be made public. Second, it's read-only access (so you can't add events to iCalendar from Google Calendar).

1. The easiest way of doing this is to log into iCloud and then go to the Calendar section. You should see all of your calendars listed in the left sidebar (Figure 5).

All of my various calendars are found in the Calendar section of iCloud.

2. Click the icon at the right edge of the calendar you want to add to Google Calendar.

3. Then, from the popup (Figure 6), click the checkbox for Public Calendar.

Setting the calendar as public so it can be shared.

4. A webcal address will appear. Click Copy Link and click OK. 

5. Go to your Google Calendar and locate Other Calendars. 

6. Click the + button associated with that.

7. Then, from the drop-down, click From URL (Figure 7).

Adding a new calendar to Google Calendar from a URL.

8. In the resulting window (Figure 8), paste the webcal address in the URL of the calendar field and click Add calendar.

Adding the webcal address in Google Calendar.

You now have to play a waiting game, as it might take up to 12 hours for the population of events to complete. Eventually, however, you'll see all of the events from that shared calendar within Google. 

By adding these calendars to one another, I can be certain I always have access to my events, no matter if they're on Google Calendar or Apple's iCalendar.

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