Hi Tricia!
Thanks for getting in touch with us! I’d be happy to help you with this topic.
The URL you are using is to embed the Google calendar somewhere else and won’t work to import your events with Event Aggregator.
You should use the Public address in iCal format URL, which you should also be able to obtain from the calendar settings. However I do not see it available from the screenshot you sent. I believe you must be the owner of the calendar in other to get the iCal address from its settings.
I hope that helps. Let me know how it goes.
Best,
Victor