Finding and deleting unwanted app
This is a tough one. Several years ago, I installed one or more apps that would notify me BY VOICE when an appointment was upcoming. I don't remember all of the details, but that app has come back to haunt me, Several times each day, in a voice loud enough to interrupt my telephone calls, I'm told about an appointment with Dr. Gistaro plus recent notifications (Today, I was told about my attempt to to get a new password for Apple Support Communities.)
It seems to me that the app was somehow related to Calendar, but I have found that I cannot delete Calendar. In any event, is there any possible way that I can find and delete this annoying app? ( I think it's an app)
iMac 27″, macOS 10.15