If it has been downloaded to your computer, just double-click on the .ics file. It will offer you choices to include it on one of your calendars, or create a new calendar.
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
How can you add .ics file to apple calendar app
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.