Post History

If you really want to limit the number of parallel challenges, maybe put up a meta thread in August, "propose the September challenge", and the one with the most upvotes gets used (subject to broad mod approval, the "Boaty McBoatface" rule.)

But it might be better to allow two parallel challenges every month -- one that must have near-universal appeal, i.e. no religious holidays or mandatory meat ingredients, and one that can be more narrow, like Christmas cookies or Passover desserts.

(Hm, an ethnicity-of-the-month might be fun, but that's veering WAY off the original scope.)