Defining the Genre
-Primarly diegetic media (public service announcements, posters, documentaries, game shows, etc.)
-The Event is not defined. We do not see The Event occur or learn exactly what it is, but details and hints are present.
-Horrifying details are presented blandly and dispassionately, or with inappropriate emphasis.
-Connections are implied. The audience is encouraged to put the pieces together.
-The camera is not a participant.
This genre is distinct from found footage horror films, where the viewpoint is a participant or direct witness to The Event, or films where The Event occurs and is later fully, or mostly, explained.
It is not recorded what Orchard thinks of the Violent Unknown Event, and he is very noncommittal about any opinion concerning the Responsibility of Birds, though in an unguarded moment, he has described his enemy as The Fox. This might be no more enigmatic than a reference to his profession as a seller of chicken wire.
-The Falls, Entry 1: Orchard Falla
The world has been struck by a mysterious incident called the "Violent Unknown Event" or VUE, which has killed many people and left a great many survivors suffering from a common set of symptoms: mysterious ailments (some appearing to be mutations of evolving into a bird-like form), dreaming of water (categorised by form, such as Category 1, Flight, or Category 3, Waves) and becoming obsessed with birds and flight. Many of the survivors have been gifted with new languages. They have also stopped aging, making them immortal (barring disease or injury).
-WikipediaThe Falls is deadpan, absurd, and brilliant. The trailer covers the basic format. It might not be the origin of this genre, but I suspect it's more influential than people think.
A perfectly ordinary local television station. Though I think "Contingency" (linked above) is the best short they've produced, "Weather" is closest to pure Event media.
The Event - Mitchell and Web
Stock up on basic supplies. A suitable shopping basket would include sand, tinned tomatoes, and six hundred toilet rolls. Get your supplies early, as smaller shops may run out of sand.A series of linked skits about The Event, beginning (chronologically) with an eerie PSA and ending with a slowly collapsing game show.
A long-running podcast styled as a small town radio program. It's famous enough to have books in big book stores, so presumably it doesn't need an introduction.
An image-based blog about an imaginary town where it's always the '70s. Always. Some posts are closer to current political satire than Diagetic Horror, but there are some superbly eerie posts buried in the archives.
A relatively new, location-specific blog about a fictional national park. The author's found the perfect mix of deeply disturbing and utterly banal details.
Debatable Media-Lessons Of Darkness (1992)
-The Visit (2015). I've been unable to locate a copy of the full film, but the trailer, stripped of context, seems to qualify.
-The SCP foundation, if you stick to some of the early articles only and ignore the vast realms of explanatory fluff that have sprung up over the years.
-Bits of The League of Gentlemen apply.
If you've got other suggestions, post them in the comments.
Why Do I Love This Genre?First, it tickles the human need to pattern match and problem solve. A web of connections is presented; the reader is rewarded for making connections and catching obscure internal references. There's craft to appreciate.
Humans are also very good at adapting to remarkably terrible world-changing events. There's a reason this genre tends towards '50s-'70s aesthetics; the first age of mass media, looming feasible global apocalpyses, and cheerfully dreadful government announcements.
Since we're in the middle of "The Event" right now, we can watch euphemisms and jargon go from strange to common in real time. "Flatten the curve", "social distancing," "N95", "isolation", etc; without context, a current news report sent back in time 1 year would be as alarming and interesting as anything in "The Falls".
So sit back, relax, enjoy the Event, and consider the Theory of the Responsibility of Birds. Or perhaps of Bats.