I can share info on calls for participation!
As @apurva mentioned, Calls for Participation should be posted in the Contributor Marketplace. Create a new topic and include the role you’d like to fill and the subject of your book in the title so that potential contributors can browse with ease. This post includes more details on what to include in a Call for Participation.
To amplify these Calls, I recommend replying to this thread. I receive notifications of new replies to this thread. I then amplify the Calls through the Rebus Community Twitter and on the Rebus Community Newsletter. If you have any more questions about what we do to reach out to contributors, let me know.