Ooo, Ooo, Ooo I've got another idea.
@DrownedFishOnFire @SillyOldBear @1964dodge
What about just having an eternal Jim's Cafe Announcement/ Link thread?
Step One: Tag lots of people who might be interested in joining Jim's Cafe
Step Two: Ask anyone who wants to join to click on the "watch" button on the top right of the original post
Step Three: Whenever a new Jim's Cafe is created, the Cafe starter could post a link to the new cafe.