Is there a way to prevent the creation of back dated events ie the Start Date must >= today.

Reason for question. We want to allow Registered users to add impromptu events into the club calendar, but they can only be created for today or the future. No back dating is allowed. The "No Back Dating" of events is for regulatory requirements associated with vehicle registrations.

I have 3 websites for 3 separate car clubs that want this feature.