Trying out groups...
Installation and Configuration
But as I explained above, they can upload Galleries and tag them with one of the City Profiles, then the City Profile page(s) can list all galleries appropriately tagged.
Is that what you are trying to do, or am I missing something?
You can try the groups module but I think if Groups were Cities, you'd still need to do the same thing.
If you want, I'll knock something up to show you how its done.
updated by @paul: 12/29/14 09:23:54AM