What are these notifications?
Thankfully, these are just calendar notifications and your device does not have a virus. At some point, whilst surfing the web, you or another user of this device may have accidentally subscribed to a fake calendar.
Why are these notifications created?
Scareware and adware producers create these notifications within your calendar to trick you into thinking your device has a virus. These notifications are part of malicious advertising campaigns that link you to official-looking iPhone websites trying to scare you into downloading and subscribing to their useless apps and services.
How do I remove these notifications?
If you do receive notifications like this, all you need to do is delete the calendar subscription. To do so please follow these steps:
After you have completed these steps, you should no longer receive these notifications.