How do I migrate iCal to Google Calendar?

Hello AdirondackJoEllen,

Thank you for reaching out to Apple Support Communities.

These steps will help you export from Calendar:

Export a calendar’s events

1. In the Calendar app  on your Mac, click the calendar’s name in the calendar list.
2. If you don’t see the calendar list on the left, choose View > Show Calendar List.
3. Choose File > Export > Export.
4. Choose a location, then click Export.
5. The events are exported to a calendar (.ics) file.

Export all calendars

1. In the Calendar app  on your Mac, choose File > Export > Calendar Archive.
2. Choose a location, then click Save.

As outlined here: Import or export calendars on Mac

This article will walk you through importing to Google once exported: Import events to Google Calendar

Hopefully this helps.

Cheers!