In a remix challenge, the moderators assign to each writer another participant's work. Each writer selects and rewrites at least one of their assigned participant's stories, with the expectation that another participant will do the same to one of the writer's own stories. Some fanfiction authors permit or encourage other writers to remix their stories at any time, without the structure of an organized challenge. Other fanfiction authors believe that unauthorized remixes are a violation of their moral rights as an author. Remixes should not be confused with a certain type of responsefic.
Remixing techniques include (but are not limited to): retelling the same events from a different character's point of view, switching the narrative voice (e.g. from first to third person), changing the tone of a story, focusing on a different point in time in the same sequence of events, covering a smaller or larger scope of events, or writing an AU. Writers sometimes incorporate the dialogue or description of the original work into their remix story.
The word 'remix' to describe this rewriting and re-telling practice was chosen as a riff on the practice of remixes in pop music, where the vocal and instrumental tracks of a song are rearranged in time, speed, duration, or possibly entirely replaced. - from
https://fanlore.org/wiki/Remix Keep an eye on this space. More details on how the first round of Inception Remix will function to come.