For any events, challenges and games you want to run. Challenges can be as formal or as relaxed as you like - writing sprees, themed prompts, fill fests and whatever else you can think of are all welcome! Please note that you shouldn't post actual fills on this post; please put those in response to whatever prompt they're filling and paste a link here, if needed.
You can make a thread on the discussion post advertising any new challenge, but the bulk of challenge-related activity should happen here.
On this post only, anyone running a challenge may post logged-in in order to be able to post clickable links & keep track of responses.