From Disney’s YouTube page:
“Here’s your chance to share your most cherished Disney Parks memories with other Disney fans around the world and WIN a stay in the exclusive, new Disneyland® Dream Suite! Just submit a video, up to one minute long, of your favorite Disney Parks memory.

One Grand Prize winner will receive a once-in-a-lifetime trip to the Disneyland® Resort, including a night in the Disneyland® Dream Suite, airfare, 2-day Theme Park passes and ground transportation for a family of 4. Finalists will receive an Annual Pass to the Disney Park of their choice.”

Of course, the complete rules are at their site. August 5th is the last day you can submit, so start recording right away.