You can import calendar files that you have exported to a file previously by following these steps:
- Log into your Gmail account and click on the 9 box button, shown below.
- Click on "Calendar". This will open your calendars in a new tab.
- If you want the calendar you are importing to be put into its own calendar, and not added to an existing one, then you'll need to create a new calendar.
- Click the arrow next to "Other Calendars"
- Click on "Import Calendar"
- In the window that pops up, put in the location of the .ics file you wish to import, and the calendar you wish to add it to.
- Click "Import"
- It will give you confirmation of the events it was able to import, and they should now show up in your calendar.