Rainbow Day is a special day that the Smurfs celebrate which appears in the cartoon show episode "How To Smurf A Rainbow". It usually begins with a raincloud that appears over the Smurf Forest on that day, which then dissipates and leaves behind a rainbow. The Smurfs gather around the Great Oak Tree, which is decorated with streamers of various colors, to see the rainbow appear in the sky, and then return to the village to have a Rainbow Day party.