Hi Keith - your best bet for something like that is to open your scheduling app in a lightbox.
I’d recommend following the steps in the article at http://support.unbounce.com/entries/3… that explains how to open a Privacy Policy, Terms of Service etc. in a lightbox. The process will be almost identical.
One thing to keep in mind is that the script in that article will only trigger the lightbox from a text link. If you want to trigger the lightbox from an image instead, use the code that Carter wrote in his comment at http://support.unbounce.com/entries/3…
Let us know how that works for you
UPDATE:
We’ve released a new feature into beta that allows you to build/launch your lightboxes directly within the page builder itself. This new release will allow you to add images, videos and even forms to your lightboxes.
Go check it out and sign up for the beta here .