It's not really a challenge since the goal is too increase the activity on the website by promoting certain topics. Wolrdbuilding SE is over 300 days old and half of the religion question were asked during the 14 days of the "challenge". Since, it doubled the number of questions for that tag, I would call it a success.
The questions are usually show in order with the oldest first or the newest first (it depend on the person writing the message).
We also used to write every single answer as well because the goal is to give good quality content not just to produce unanswered questions. We stopped doing it because we have an average of 5 answers by question and it takes a lot of time to enter them all.