Raising security awareness with a CTF competition... did you already participate in one, how it was?

Example of a platform to organize one can be found at https://github.com/facebook/fbctf/wiki

TLDR

CTF or Capture the Flag is a competition aimed to raise awareness around security in an organization of any size.

The competition is made of several challenges with different levels of difficulty and expertise that are up to the organizer to setup.