How can I unlist opportunities automatically?

I want my customers to book event dates via JotForm. I have several date opportunities for this event, but only 20 applicant can be registrated for each. I want my form to unlist the dates that are filled in (where the number of applicants reached 20). Is it possible somehow? Thank you in advance for your help!

There is no option to set limits on dates in our DateTime field. A workaround would be to use the following widgets that would allow you to set available slots.

https://widgets.jotform.com/widget/inventory

https://widgets.jotform.com/widget/appointment_slots

https://widgets.jotform.com/widget/ticket_purchases

To add a widget to your form, follow our steps on this guide: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form. 

Let us know if you have any questions.