Enroll multiple people on one submission but disable after limit is reached.

I have a registration for where people can sign up for more than just one person (i.e. all the people in their family).

There are a limited number (129) spots.  How can I make the form disable after all 129 spots have been filled?

https://form.jotform.us/70615310583147

Yes, it is possible to achieve this with JotForm, you will need to use a widget to add the available number of times the options can be selected. 

Here're the widgets that will allow you to do it:

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

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

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

This guide will help you to add a widget to your form: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form 

Do note that the widgets will not disable the form, they will get disabled when the available number of selections is reached. 

Additionally you can limit the submissions on your form, here's a guide that will help you with that: https://www.jotform.com/help/137-How-to-Limit-Submissions-in-a-Form 

Hope this helps.