I have a task list / calendar that serves as a signup for classes. What I am trying to do is set 20 people per class per date. Once 20 people have signed up for the class (i.e. - once we have 20 list items with the same date), the date is no longer available for folks to sign up for.
I'm trying to use a workflow for this, but can't figure out how to make this happen.
One more thing - this one list will contain multiple dates, but there can only be 20 people that sign up for each date.
UPDATE - EDIT - Screenshots Below are screenshots of the workflow (in Nintex)