Did I miss anything out?
There is no word limit as such, but aiming for 1k-10k words would seem reasonable.
After the revelation of the authors, there can be a decision by the persons involved - (s)he by whom and (s)he for whom the piece has been written (I believe passive is tolerable here) and the full length text can be attached.
Since it's pretty well certain somebody's going to be running late (I still haven't received mine for SS4), if any of the themes inspires you, write a spare piece, after having submitted your requested one. Certainly, this could result in someone getting two interpretations, but this is more pleasant than none at all.
Whilst the pieces do not appear in their entirety on the forum, and so writing standards are a little more relaxed it is polite to assure that at least an excerpt worth be family friendly, with no determined pornography, excessive delectation in torture or unacceptable language. If the full length version is to be attached, this holds for the submission as a whole
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However early you write even if you start as soon as the subjects are requested, before they are handed out, springs is going to get in first. This doesn't seem to be a rule of the game, just a law of nature. I think there is a sort of committee meeting deciding whose job it is to run really late (with excuses) and drive the admin nutser (must already be nutsish, or wouldn't have volunteered)
November would seem a very bad month to set the writing, with numerous potential contributors attempting to generate 50k nanowords.
Chrispy is not allowed to use his red pen on anybody's contribution. In which case, nobody else is, either.
I'm very bad at it, so will join in to improve.