The Disneyland Canoe Races started back in 1963 as a friendly wager between cast members from the Indian War Canoes and the Jungles Cruise. The bet was to see who could paddle fastest around the Rivers of America. The race took place before the park opened to guests. The idea caught on and the tradition continues to this day--not just in Anaheim, but at the other Disney theme parks as well.
The Seven Dwarfs were featured on a cast member commemorative poster for the 52nd annual Disneyland event in 2015. It measures 12" x 15". Not available to the general public.
Poster image and additional info courtesy of the Kevin Hicks Collection.