What about a "happy hundred" featuring 100 words taken from anywhere in your existing MS which reflect what you consider effective writing? I suggest a two week posting period.
We might also have a April Fool's challenge for the first week in April: 100 words which are really giving you trouble for whatever reason. This version would definitely invite others to critique.

I don't see setting up context as exceeding the 100wc limit on either aspect of the challenge.