Max number of items available

I have Workshops with only room for 5 spots available. How do I set the form up to show available spots left?

You can try the following widget: https://widgets.jotform.com/widget/appointment_slots 

You will find the demo to see how it works:

If you need to add it to your existing form, please follow this guide: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form 

There are also other similar widgets that you can try: https://widgets.jotform.com/search/available 

Let us know if you need more help.