How to reject spam ads in Apple’s mobile calendar?

If the Settings-iCloud-Calendar option is turned off, you will not be able to receive or see it.

If you have obsessive-compulsive disorder and don’t want to turn it off and want to delete spam, then enter the calendar and click in the middle below the calendar There is a word "Calendar", click on it and there is an editor on the upper left. Check whether the spam is at home or at work. Just delete it and then create it again or not. It doesn't matter.