Removing a subscribed calendar from Calendar on Mac.

MacBook Air M2 13inch base model Mac OS 26.1.

I had an Gmail calendar, that I used for classes that I teach. I accessed it via subscription, rather than as a normal calendar. The Gmail account was not used for much mail, and had become the target of large amounts of spam, and phishing emails. I decided to shut it down. Prior to shut down, I removed the subscription and account from all of my Apple devices, except I forgot the MacBook Air. I tried unsubscribe option, and it does not work, because the underlying account is no longer valid on Google. How do I delete the listing of the calendar out of the calendar list? I was able to remove the internet account, but not the subscription.