How to delete duplicate photos from an iPhoto event? I did a stupid thing with one Event in iPhoto library. I thought of making a copy of this Event, and I did use the menu duplicate.

Instead of creating another copy of event, it did copies of all the photos inside the existing event. (new to iPhoto usage ;-))

So the big task I have is to delete the possible duplicates of 350 photos. Is there any tool/ option in iPhoto/ apple script etc.. to accomplish task ?
Just because there are duplicates within iPhoto, doesn't mean that iPhoto actually has duplicated the file.  Navigate to ~/Pictures/.  Right-click on iPhoto Library, show package contents.  Find your event within Originals/&lt;year&gt;/&lt;event name&gt;.  Backup the directory.  Remove the event from iPhoto - I don't know if this removes the actual folder or not, that's why I suggested backing it up first.  Re-add it.  Voila.

Let me know if it has actually duplicated the files.  I know of a great duplicate removal app, but it's not free.