To enter the Arts & Sciences competition, each entry must relate to the Cleftlands in some way. It could be something you learned at a Cleftlands event, or something you made for a Cleftlander, or whatever else, but the link to the Cleftlands must be there. The only requirement for documentation is that you explain what that link is. You do not need to have any written documentation, just explain how it relates to the Cleftlands.