When you export events ot event folders from iPhoto library to another location, it will create an another copy of all your photos. You will see one copy in the Photo Library and one copy in a exported Event Folder. Once you have exported all your photo albums from iPhoto to another folder, you can easily delete them from iPhoto.
If you want to delete an Event from iPhoto library, go to "iPhoto" and select the event and then press "Command + Delete". You can also drag the event in the iPhoto Trash Bin located at the bottom of the left panel. This way you can delete an exported Event folder from iPhoto Library.
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