Would appreciate your insight on this.
We would like to enable contacts to submit event form only once. So when person would try to re-enter the page and submit the form again, Submit button will be blocked and message will pop-up.
Not sure if Form settings and Custom Form HTML would work here, as we want to block the from re-submitting not only hide for known (cookied) users. In other words, we want to be sure that person has submitted the form at least and only once.
Appreicate your help on this.