What is the difference between "organize project files" and "Organize Event Files"?

Thanks

No difference. Organize means find all the Original media files, and copy them into the appropriate FCP X folder.

For Events, obviously it takes anything living outside of the Event folder and moves it into the Event folder. Really good to do just before archiving Events.

For Projects, it takes anything living outside the appropriate Project folder, and moves it all into the Project folder. Yeah, pretty odd, but yes, it makes the Project folder also act like an Event folder, also. I'd only use this when I'm moving a project from one workstation to another.