The Shouting Moons are simply whichever moon or moons are prominent at the time of the regulatory shouting, which is always conducted during Days of Destruction, which can be announced at any time by the Mthyuh Preservation Society.
Important shimmering of the regulatory codex happens between partisan representatives either in different parts of heavily wooded areas or at the edges of adjacent cliffs or even sometimes in abandoned bone nests, which can hang from the cliffs as long as the rock can hold them.
K's peering from the occupied nests lounging in caves or soaring above keep mostly quiet during Days of Destruction. Legend holds that the festival was designed for that reason: to hypnotize Mthyuh's hosts.
They wanted and needed to hypnotize K's not to have a big party but so that they could get done all the doables they couldn't do as random prey owing to the burdensome and costly precautions they had to take in order to take turns in an orderly fashion to calculate who can have a chance to be eaten next, and so on.
Plus, even a single K's earsplitting HAHAHA and its wingspan against the sun, creating temporary climactic changes and blinding darkness, all of that had an effect on overall sanity, even of pets, and this was the most caring respectful traditional way possible to get Ks to just stop.
Flekes themselves of course don't make critical inquiry upon their own generational habits and mostly consider the rather low chance of a violent, live blood sacrifice the least of their worries. The specter of living to a very old age is the greater terror.
The partisan fleke representatives shimmer the codex during the Shouting Moons from forest meadow to forest meadow or cliff to cliff and they must conduct the regulatory negotiations only by shouting back and forth as loudly as they can. This tends to keep the messages short and heartfelt. They all know the festival is only a weekend long. But they have needs, which tend to be generously met if they can get them across and back again, sometimes heavily depending on the winds.
The partisan fleke representatives must wear very bright robes as a sign that they are vulnerable and evocative to Ks and that their spiritual duties always come first. Again, these details are not on their minds at all. It's just another day for them. Some might find all of this fascinating and even life changing if they ever sat down to reflect on or read about it if, no that isn't fair: reading's not a thing for them. Maybe they might talk about it with another fleke on a break or, it is said, share it with their faces only.
During the Shouting Moons it's very important that you remain as still and quiet as possible. Ks nodding out during DoD can wake up. The whole idea is that everyone cooperate at this time, even guests. Allow Mthyuh's hosts to feel the tingling in their spines and pyncos. They say the regulatory shouting first started when the early flekes figured out how to distract a K for a few minutes by shouting at it simultaneously from adjacent hilltops. Eat me first! That is how that famous chant became part of the fleke daily parlance, especially during volca, when one may shout out Eat met first! and it's never a non sequitur. This wish must be at front of mind.