Currently Being ModeratedFeb 22, 2013 8:07 AM (in response to oclappen)
No, not possible. Other than for Chapters there is no search function in iMovie.
Currently Being ModeratedFeb 23, 2013 5:20 PM (in response to oclappen)
Yes you can do this. You can create your own keywords and use them to select footage in an event.
See iMovie Help here for details.
Sorry. I answered this yesterday, but I think I lost the connection in a moving car.