Deleting iPhoto Events

I have been moving images out of the iPhoto Events folder and into new/existing albums and then deleting the old album under events. I notice that when I did this, the photos I just moved disappear from the album I just moved them too. I was under the impression that when you move them into another album they wouldn't delete even after deleting the old event album. What am I doing wrong that is making this happen?

When creating/ moving to a new album, I highlight the photos > go to the plus sign on the top right > click new album > then I either Enter a Name in or I choose an already existing album and click OK. I don't understand what I am doing wrong that they delete when I delete from the Events folder when they are moved into a new album.

Please help!