Speaking as someone who participates in fandom as a reader only, I'd love for this comm to be a resource, in terms of being able to find stories, so I'm most interested in how content will be organized and archived (e.g. tagging, master lists). I'd like for people to post recs and/or promote older material.

That being said, I think there should definitely be some kind of regular activity to maintain interest and generate new content. I think a flashfic model with periodic challenges and deadlines either using themes and/or prompts is a good idea (as opposed to an exchange because sometimes it feels like the stories can become too tailored for a recipient; also sounds like a lot more work). I think leaving the comm open for left-over prompts (maybe in an 'amnesty' period for people who need deadlines) is also a good idea.

In terms of generating works beyond fiction, what are you referring to exactly? E.g. art, meta, discussion posts, vids, etc? Others' ideas on using daily/weekly/periodic themes seem to work well on other comms.

Re kick-off activity: I like the idea of a prompt-based fest for people to submit and write (and create) whatever. I think round-ups (e.g. creating weekly/periodic lists of content) would be helpful to avoid missing new stuff that's been generated and to maintain momentum.