Proforms question

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Hi all,
Since proforms essentially has no support anymore from it's maker, I'd thought I'd ask the brain trust here who might have used it more than I.

I'm trying to make a form that is a sign up to an event. Within the form is a radio button field which lists a variety of time slots one can choose from. I'm trying to figure out a way to limit entries on the various time slots , ie. the time slot gets full and no one else can enter into it.

I'd tried using Proevents but that failed miserably and threw errors when trying to pull the form data into a page.

Anyone have any ideas how to do this?

Thanks,.

growlrooed