johnso29,

Found the "official" instructions............

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Import events from iCalendar or CSV files
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To import events from iCalendar or CSV files, just follow these steps:

1. Click the Add down-arrow button at the bottom of the calendar list on the left side of the page, and select Import Calendar.
2. Click Browse and choose the file that contains your events, then click Open.
3. Select the Google Calendar where you'd like to import events, then click Import.

Please note that recurring events may not be recognized when importing events from CSV files. In this case, individual items will be created for recurring events that fall between the dates you've selected.

Learn how to export files from popular calendar applications. Visit our iCalendar and CSV help articles to find out more about these file formats.