I have an existing EM Calendar that I am trying to sync with Google Calendar. I have found lots of support on how to sync the calendar when creating an account in EM, but nothing that tells me how to sync an existing calendar.
I forgot to note (in case it is important) that my calendar location is Local Folders/Calendar/
Unfortunately you cannot sync a local calendar as that would make it no longer local. Local calendar is by design completely separated from any server syncing. You can, however, export all the events from your local calendar by going to File>Export and selecting export events to .ics and select your local folder.
You can then import those events into your Google Calendar.