Hi Sean!
I suspect that is indeed possible – and our Themer’s Guide remains the best starting point for this kind of tweak (I realize you probably are aware of that – it’s more a note for others coming across topics like this one).
The data used to generate the saved organizer/venue lists primarily consists of the IDs and names, as loading all organizer/venue data could potentially be a resource intensive operation. It could certainly be fetched lazily, though, in the sense of showing and populating those fields only after they are selected.
Alternatively, if you know you have only a limited number of organizers/venues and performance is therefore not so much of a concern, you could load them all en masse and deliver the complete range of data all at once.
Whichever approach you take, the customization is possible but beyond the scope of support we’d typically provide here on the forums.
I hope that at least gives you some avenues you can explore 🙂