Suggestions: 1 - Include the relevant time/date range in this post, rather than relying on indirect reference to the main post to derive the time/date range. 2 - Add a challenge tag - "challenge-1" for this week, "challenge-2" for the next one, etc. Then there would be no need to link over here, as people can search based on the tag. (three-weeks or nine-days tags should still be required though for content reasons). I bet @ArtOfCode could even prove an automatic list here of matching posts.

@manassekatz I don't think meta-tags like challenge-1 on main-site questions are a good idea. Q&A is for posterity; challenges are interesting for a short time. I think it's better to build an index to record the challenge.

The problem is "build an index". If you ask me, in general, to build an index, I will figure out a way to automate the process. With a tag, that's super easy. Without it, it is not. I am trying to think outside the "Here is how it was done on SE" box. The difference from Photo or Cooking contests, of course, is that good Q&A for these challenges is good Q&A period, where photo or cooking contest entries are not. Because of that, putting all the actual challenge entries in main Q&A makes sense.

Putting the challenge entries here would effectively hide them from people who only look at main Q&A, which doesn't make sense, especially if (as is the case this time) the challenge is a timely topic. Hierarchical tags could help: challenge as the top level and challenge-1 etc. below it. A little extra tag clutter, but:

• Makes indexing trivial
• If someone wants to review all the questions, they can just search on the tag instead of having to bounce between the index list and main Q&A.

@manasseh Just to clarify what exactly you're suggesting – If someone wants to see all the posts involved in this contest, they'll navigate to the contest post and see all its entries. If someone just wants to look up questions on the three weeks, they'll filter by the three weeks tag. Is your suggestion only to make it easier to collect the entries in the first place? (1/2)

@man (2/2) There's also another critical difference from Photo or Cooking in that it's not really a contest in the sense that there's no competition. If it's a contest, then the natural way to do it would be a separate Q&A forum, exactly the way that they've done so. This is more encouraging people to ask on a topic that people seem excited to ask about. Because the entire nature of the challenge is different, its organization naturally will be as well.

Is your suggestion only to make it easier to collect the entries in the first place Correct. By using a special tag, all OP would need to do is add that tag. The challenge page would automagically show the list - i.e., not "all 'three-weeks' tagged questions" but only (and exactly) every question tagged for the challenge. If a question gets deleted (e.g., duplicate or troll) then it would disappear from the Challlenge list with no extra effort by anyone.

Actually there would be an additional benefit, of sorts. In addition to going to the Challenge page and seeing, together with the Challenge topic, all the questions with links, they could also go to the main page and search b tag challenge-1 and see everything (in normal Question List format instead of the abbreviated form on the Challenge page).

Brilliant idea: We don't need an extra tag. @ArtOfCode can easily add a function (words no developer wants to hear...) to collect the posts based on: date/time range + tag(s). Anything 7/15 - 7/21 (or whatever) + (three weeks | nine days) == in the list. No fuss, no muss.

@manassehkatz better to add date-range support to search, and then anybody can use it to populate this list or for other purposes. (On other sites I've sometimes wanted to constrain a search by time.)