How to prevent unwanted calendar spam?
How to prevent spam calendar events?
iPhone 11, iOS 14
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To remove it, see below. To avoid it, do not accept offers from websites to send Notifications or other such freebies.
If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account.
If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account.
The Apple support article is below.