not all of my iPhoto (9.4.2) Events transferred over.
What do you mean by "transferred over"? Don't you see all your iPhoto events, when you open your iPhoto library in Aperture? Or did you expect Aperture to merge automatically your iPhoto Libraries and Aperture libraries? That will not happen - you have to import your your iPhoto libraries into your Aperture libraries, if you want to have a single library.
Unified library means, that iPhoto and Aperture can use each other's libraries, but will not automatically unite these libraries into a single library. So if you want one single library, use Aperture's command "File > Import > Library" to merge your iPhoto Libraries into your current Aperture library.