Tracking names/emails

I am using the Registry Drawdown widget to take reservations for events that have limited capacity. Is there  a way to track registrants so that they cannot go into form and reserve again either for another date on the drawdown or the same one?

You can enable the unique question for that, here's the guide: How-to-set-Form-Limits-Based-on-a-Unique-Question

Please give it a try and see if that's what you're looking for.