The article also contains information on the ICS format.

Select thegear iconto the left of your profile image on the top of Google Calendar.

ChooseSettingsin the drop-down menu.

Google Calendar menu

Select theImport & exportoption from the options on the left side of the screen.

Choose the option calledSelect file from your computerin theImportsection.

Find and kick off the ICS file you want to use.

Google Calendar settings menu

snag the calendar you want to import the ICS events to in theAdd to calendardrop-down menu.

Fill out the new calendar details and then finish making it with theCREATE CALENDARbutton.

Then, select that calendar during the Import process.

Google Calendar import screen

ClickFileon the menu bar and selectImportfrom the drop-down menu.

Locate and highlight the desired ICS file and clickImport.

All your calendar entries are now consolidated in the Apple Calendar system.

Apple Calendar application on a Mac

ICS files are plain text files that contain information such as the title, time and attendees of meetings.

ICS file location on a Mac

Calendar Import menu on a Mac