I recently rebuilt my iphoto 09 library and now all the pics are in one folder instead of events. How do I get 20,000 pics back into the correct events?

Question

I recently rebuilt my iphoto 09 library and now all the pics are in one folder instead of events.  How do I get 20,000 pics back into the correct events?
I have a macbook pro Version 8.1.2 and I am using Iphoto 09
I rebuilt library because many pics were black and now they are in one folder labeled "Recovered"

Answer 1

Do you have the original iPhoto Library (before you rebuilt it)?
If so, I suggest you rebuild it using iPhoto Library Manager, a program you can download. It does a better job of rebuilding. It also leaves your original intact and makes the rebuilt Library a new file (package).
If you don't have the original (say, from a backup), then you should probably first back up the library that you have before trying anything.
After making a backup of it, look along the left side, you will see Events and Photos. Is there anything in either of those areas?
If not, it sounds like all your photos were recovered and put in Recovered during the rebuild. iPhoto Library Manager might do a better job with this. In any case, if there are no photos in Events or in Photos, try selecting ~ 5 photos in Recovered and drag them to Photos. Do they then show up there with the correct dates? Do they also show up in Events after doing that? I am suggesting just a few photos before you try it with 20,000.
If the photos inside your "recovered" area are also in Photos, then don't do the above steps. I'm not sure I can help you if your 20,000 photos are in Photos but not Events. I'd try iPhoto Library Manager instead with its better rebuild.
If the 5 photos experiment works, then I would try it with ~ 200 photos at a time, going through your entire collection. You'll need to do this about 10 times if you really have 20,000 photos. Remember, don't do this if the "recovered" photos are already in "Photos."