It's a beautiful tribute to the SPN Family and what makes the circle of the fans, the actors, and the conventions an incredible phenomenon.
The other 3 are equally awesome (and also by the youtube user Supernatural Conventions) and I saw some convention clips I'd never seen before. If you haven't been to a SPN convention, these videos just might convince you to go!
This one's really long (28 minutes!), so grab a drink/snack and enjoy.