1. Open the Calendar app on your Mac.
2. Select the Calendar you would like to export by clicking on it's name on the left menu.
3. At the top of your screen you will see the action bar for Calendar, select File.
4. Select Export, and Export again.
5. This will open your file explorer, pick where you would like to save the ICS file.
After exporting your Calendar, you can import the ICS file into Zola Suite.