Volunteer Form with slots limit

I am trying to set up a volunteer form. I would like those who are signing up to see who has already signed up on the form and see how many more slots are available.

Example:

(For all dates we need 6 people)

January 8 - [Slot 1] [Slot 2] [Slot 3] [Slot 4] [Slot 5] [Slot 6]

January 15 - [Slot 1] [Slot 2] [Slot 3] [Slot 4] [Slot 5] [Slot 6]

January 21 - [Slot 1] [Slot 2] [Slot 3] [Slot 4] [Slot 5] [Slot 6]

etc...

If someone has already selected a slot previously, I would like the slot to show, but not be available.

Is there something that would cater to this kind of functionality or be similar to what I need?

You can use gift registry widget if you want the counters to decrease once it's selected.

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

If you want to allow multiple quantities to be selected, use this http://widgets.jotform.com/widget/quantity_gift_registry

Using this widget, you will just have to list all the available dates and the number of slots/quantities. Once the user picks the slot and submits the form, the number will be reduced.

If you want to check duplicate entries, you can enable unique question by filtering duplicate values from a field. Guide: https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question

If you need further help, let us know.

Thank you for responding. The Quantity Gift Registry widget is closer to what I need, however, I would like people to see how many slots were taken. How do I get this functionality within the same question on the form? 

I have already tried the grid report idea and it is too cumbersome to scroll up and down or go between two different questions on the form. 

I'm afraid that it is hard to make it show the taken slots from the widget. What my colleague suggested, the Quantity Gift Registry Widget, is the best option to have a slot available option in your form as well as an option to disable the field if the slots are taken.

Another way around would possibly be to create a form with regular fields and conditions that will calculate taken slots, but not sure if it could completely work for you for what you need. Something like this:

Please let us know if this could work for you by any chance.

Thank you!