JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Are you going to limit the number of registration per item? Please take a look at the following widgets:
https://widgets.jotform.com/widget/date_reservation (date widget)
Here's how you can add a widget in your form: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form.
Please check and let us know if you need a few specifics.