Export an Outlook calendar to Google Calendar - Microsoft Support
https://support.microsoft.com/en-us/office/export-an-outlook-calendar-to-google-calendar-662fa3bb-0794-4b18-add8-9968b665f4e6
WebLog onto your Google Calendar account. At the top of the page, click the Settings wheel > Settings. Along the left side of the screen, select Import & export. Click Select file from your computer. Pick the file that you created when you exported your calendar from Outlook, and then click Open. If you have multiple Google calendars, use the Add ...
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