Pre-register Notify For Sub-gallery?

With the pre-register notify option, is it possible to have those pre-registrations applied to a certain sub-folder?

I am doing 4 days of Santa photos. Each visitor receives their QR code before leaving, and despite having the info all over the sheet saying when photos will be ready, I still have people emailing me half an hour later wondering why they can't see their photos. 
I would love to have something where they can go to the gallery right away and register to be notified, but I use sub-folders for the different days and would only want to notify people for the applicable day. 

Sorry, there is not an option to pre-register per sub gallery.