I think the presumption of this fest has been that associated works (such as art for posted fics) is fine without prior permission, at least during the fest's "open" period. However, I know not all authors feel that way, at least not necessarily about all works.
Therefore: Authors and artists of the main event, if you're willing, please leave an explicit statement here regarding what permissions you offer or decline for works inspired by yours. I'll leave the first comment as an example.
Authors and artists of later works: You can announce your associated works here! Please keep in mind, however, that not all authors/artists are entirely comfortable with associated works, so consider whether you should check with that author/artist before basing a new work on theirs.