When users don't add "http://" or "https://" in the website and registration data fields, it creates a broke link. I am constantly needing to edit event submissions to adjust for this.
If this is not possible, we could at least add a note above the field, letting the user know to include that part of the url.
We must differentiate between http and https so user must enter that specifically. it already displays a notification when it's not entered.