Got a webcal.fi notice on my calendar on iPhone can’t get it off. Says something about moving to web Cal.guru

Check if this article helps you to remove it Delete spam calendars and events on iPhone - Apple Support

If not, get back here so we can look deeper.

I also got this event. It was showing up under an iCloud calendar called “Moon”

It’s possible a long time ago I subscribed to some moon phase calendar that was served by this company.

Anyway my solution was to delete the Moon calendar.

If you look at the event you can see which calendar the event is on. Then delete that calendar from your phone.

It doesn't matter how hard you hit the delete calendar button. the webcam.fi Moon calendar doesn't go away. I tried on iPhone, iPad, iMac. macbook pro and this pesky thing deletes and comes back in less than 10 seconds

NOT HAPPY AT ALL

Not sure how to remove it (turned up in my MacBook Air calendar). Seems impossible to delete, at least without guidance from a pro ;-)

Thanks!