What is the biggest event that is accepted by all conspiracy theorists at face value?

I would get more concrete than that and say that everybody believes that the USA threw two A-bombs on Hiroshima and Nagasaki. At least I never heard or read anybody denying that.
Of course some people say that it was a good thing, others say it was a bad thing, but they all agree it happened as told in history books.

Yeah, but only because he could not swim.

Bah humbug, I know how that trick is done-- you install a clear plexiglass sheet strong enough to support body weight about 1" under the surface.

The real miracle is where did Jesus get any plexiglass?

Makes sense. Except…if the mob WAS involved, I know J. Edgar Hoover denied the very existence of the mob because of his own personal agenda. He was kind of an early trumpy type that way. And it’s also well known that he routinely collected blackmail material on many political figures. So, WAS Hoover and the FBI instrumental in suppressing the true findings of the Warren Commission? Was Hoover himself blackmailed by the mob into ignoring them? The rabbit hole goes deeper than we think, people!

:man_facepalming: :man_facepalming: :man_facepalming: :man_facepalming: :man_facepalming: :man_facepalming: :man_facepalming:

The original question is ambiguous. Do you mean the biggest actual event that no conspiracy denies? Or the biggest false event that every conspiracy theorist accepts?

Biggest true thing. Although, also, things in general.

Are you asking for the biggest event that no conspiracy theorist denies happened? There is no such thing. Remember that some people think we are living in a Matrix and nothing is real.

The Russians are on it: https://www.bbc.com/news/world-europe-48559289

A lot of the flat-earthers don’t believe the space program is real; they’d almost certainly think A13 was a manufactured crisis, though its purpose would be to reinforce belief in round earth cosmology. For reasons.

Japanese QAnon believers think Hirohito owned the patent on the bombs (possibly after being replaced by the Koreans, along with the rest of the imperial family): Why the QAnon movement is finding followers in Japan – DW – 01/25/2021

That the sun rises in the east every day and sets in the west? Even flat-earthers have to believe that. And it is a pretty big event. How would we be if it didn’t happen?

I know they believe that 9/11 was an inside job. Do any of them believe it didn’t happen? That the twin towers still stand?

I ran across an interesting one a week or so ago. This was a conspiracy theory that the Apollo 11 mission did go to the Moon - but that all of the subsequent lunar missions were faked. The theory was that Apollo 11 found an abandoned alien base on the Moon so we were afraid to go back and possibility alert the aliens. But the government didn’t want to tip off the public by cancelling the already scheduled missions so they just faked them until they could shut down the Apollo program. This theory supposedly explains why we abandoned developing any space program further out than Earth’s orbit.

What I meant that IMHO all CT’s take bible as written testimony and true so they all believe the hoax that Jesus walked on water. So that’s then the biggest event they all take at face value.

I am speechless. I will not ask why Hirohito did not use the bombs against the enemy, I mean, a Japanese QAnon… reported by the Deutsche Welle, of all things! yeah… well, shrug
Thanks for the information. Not what I expected to learn today, but ignorance fought nontheless.

This JAnon theory seems to have its own “the elites betray us” narrative, and Hirohito is apparently one of the traitors. Maybe because he was secretly, y’know, Korean. I’m not sure how Japanese nationalism gets reconciled with ardent pro-Americanism, but Secret Plans are probably somehow involved.

JAnon! That is good. Do they (ominous music!) call it that or is it your own derision?

I believe the question is what events are accepted at face value, are accepted with the commonly acknowledged cause and result.

The John Lennon killing is a great example. Aside from a single bizarro-land dude** with a van, nobody believes that someone besides Mark David Chapman killed Lennon, nobody believes there was a sinister conspiracy to frame Chapman.

**according to that article, he called the guy who wrote Carrie, Salem’s Lot, The Shining The Dead Zone and Firestarter, who had two novels already made into movies “barely famous”.

What do you get when two solipsists meet up?
Nothing.

I give them credit for originality. It even sorta hangs together; you can’t stop a bureaucratic juggernaut like Apollo on a dime, but you can wind it down over a couple years.

Doesn’t mean I give it any marks for actual factuality. But it does make an entertaining yarn.

I don’t know if it qualifies as a “big event” by the OP’s standards, but Watergate is widely accepted at face value. Sure, some people claimed that it wasn’t a big deal, or accepted Nixon’s claim of no prior knowledge. But I have yet to hear anyone say that the burglary was staged by the Democrats to bring down Nixon, or anything like that. If something like Watergate happened now, I’m certain we’d see people saying it was a false-flag operation.