I have a SharePoint Infopath based "Registration" List that contains all form fields required for an event registration. This event has multiple sessions spread across 5 days (7 different workshops each day on Mon, Tue, Wed, Thu, Fri).
Each of these workshops have a class size limitation. Some are 20 and some are 25.
Currently I have created a separate list for each day's workshops and presented on the main registration form via external data lookup on Infopath.
I also have a Wait List of +10 for each workshop.
How can I display a pop-up message when no. of entries exceed (let's say) 20 for a particular workshop to show a "You will be placed on a Wait List"?