Participants should choose questions
This post has the intention of refining the 'No "ObserverdesignerModerator"'"Observerdesignermoderator"' idea by proposing concrete rules for selecting questions via participants, and has much of the same motivations as that post.
Instead of having the odms or some other third-party pick questions, they should be picked by the challenge participants. When a language is submitted, the sha256 hashes of up to two question URLs* should also be submitted as part of the same post. The participant must then reveal the URL to the question within 24 hours after submissions close. For a question to be eligible, at the time of posting, it must be code-golf, have a score greater than zero, have at least three answers, have no language restrictions, and its URL's hash must match the one in the submission post. Additionally, the question must remain open for the duration of the Jam and have been posted before the Jam begins. Failure of a question to meet any of the validity constraints results in the question not counting toward scoring.
In the meta post for submissions, there should be a brief section containing a snack snippet to calculate the sha256 hash of a given input, as well as a warning about common pitfalls (think trailing whitespace/query strings).
Clarifications
Nothing requires participants to submit questions
There are no penalties for the participant if a question they submit is rejected
Users can nominate their own questions, should they choose to do so
*For example, the question Scream Very Loudly has a URL of https://codegolf.stackexchange.com/questions/200306/scream-very-loudly
which has a sha256 hash of dd5ef66e6bc89a00f11e2d9d27f0d126cef4ac3b79e7e7f78c460070540f73f6
.