I am looking at something similar - generating 200-ish usable images in a shoot with 20 people, sending photos for approval to each person and retouching their top selections.
Especially when dealing with high profile individuals and want to generate individual galleries.
Well I couldn't find that in the opensource/SaaS, so I built mine.
It's possible I'll make it publicly available one day, but seeing my track record, I probably won't too :p
Maybe have a look at digiKam. It can generate HTML galleries and is the closest thing I could find to my use case. It takes a bit of tinkering, but you can generate nice stuff.
Especially when dealing with high profile individuals and want to generate individual galleries.