That's not really how Apple intended Events to be used. I agree, I'd love to see sub events, but until then, within iPhoto all of your honeymoon photos would go into the honeymoon event. Then you can create folders and albums to drag the specific photos you want to see in other albums. Dragging photos into albums does not copy them, it just creates a pointer to the original photo. So don't get nervous that you are going to be taking up twice as much space.
-Kevin