Virus issue

It isn't a virus, simply a calendar that you subscribed to.

Please see: How to unsubscribe from calendars on your iPhone - Apple Support

You DO NOT have a virus. If this is in your Calendar App, you DID click on a link which downloaded a calendar to your app.

Go to Settings > Passwords & Accounts

In the Accounts section look for a calendar you didn't realize you downloaded

Delete the calendar

Be careful when you click on links in websites you're not familiar with to avoid this in the future