Are you involved in a Drupal meet-up? Take 5 minutes to run this short "lighting talk" and tell people about Drupal Ladder. You can watch this 6 minute video to help you practice and prepare what to say.
Play it right here in your browser:
There is also this 10-minute Ladder introduction video from the Drupalize.Me Learn Drupal Ladder series, which you can just play at an event if you are not comfortable presenting.