Scam messages
How do I get rid of unwanted messages/adverts on my iPad calendar Thanks
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The problem that you describe likely being very easy to resolve.
It is highly probable that an inadvertent click on a website link has “subscribed” an additional (unwanted) Calendar to your device - and this unexpected Calendar is exposing unwanted calendar events and sending you unexpected “virus” or other warnings.
Given that infecting a non-jailbroken iPad/iPhone with actual malware is incredibly difficult, this technique is employed by malicious Actors to fool or encourage you into doing something untoward - more often than not, parting with personal or financial information leading to fraud or attempted extortion.
Let’s check for what’s out of place...
iOS/iPadOS13 and earlier: Settings > Passwords and Accounts
iOS/iPadOS14: Settings > Calendar > Accounts
Look for an “account” that shouldn’t be in the list of accounts - as this will likely include the Calendar that contains all the unwanted events. When you find the suspect account, tap - then select Delete Account. This should resolve the problem in its entirety.
I hope you find this helpful in finding the source - and in resolving the issue if an unexpected Calendar is found.