I would like to share an event in a public Google Calendar. When I click the event, it pops up with the description, but doesn't change the URL to copy. If I click Options > Publish Event > Copy Link
And then paste it into a private browser as a recipient would see it, then it asks me to sign in.
If I click Options > Print, copy the link in the new tab, paste that link into a private browser window as a recipient would see it, then it asks me to sign in also.
The calendar is most definitely public.