How to import Google Calendar(s)
Import Google Calendar by following these steps:
Step 1. Open your browser and go to www.google.com/calendar. In the calendar page, click the Gear icon in the top right of the page and open Settings.
Step 2. In the Settings page, click the Import & export option located on the left.
Step 3. In the Import & export settings page, click Select file from your computer and browse to the folder where your .ics file is located and select the .ics file you want to import.
Step 4. Once the .ics file is selected, you can then select which specific Google calendar to import your events into by clicking the Add to calendar option and selecting the calendar from the drop-down menu. Once the destination calendar is selected, click the Import button. The import process can take a while depending on the number of events that are being imported.