Sometimes, your life as an event planner requires you to move individual photos between events. Maybe you want to fine-tune the way iPhoto autosplit an event. Or maybe a travel companion emailed you some shots that she took, and you want to add a few of them to your vacation event.
There are moving plans aplenty.
Dragging. Open the events in detail view: select them and double-click one of them (page 19). Now drag thumbnails from one event to another. To give yourself more dragging room, zoom the iPhoto window (Window > Zoom) and make the thumbnails smaller (drag the Zoom slider).
Cut and paste. Select the photos ...