History: The Day History Ended

It was one of those days where everyone remembers where they were when it happened.
The only difference between this and similar days is no one remembers where they were just before.
You'd be standing there, a day like any other you've lived recently
And then you'd forget exactly what you were standing there for.

Being akin to the universal feeling of momentary forgetfulness
You'd continue walking, hoping the situation would resolve a.s.a.p.
Nothing would come to mind though, as you'd walk further
Explanations would distort beyond a simple 'silly me'

You'd remember your name, and you're current state
You'd know who your friends were and how you felt about each one
You'd just have no idea about the experiences you'd shared
You'd forget each and everything you'd ever done

Humanity reacted unanimously in the same way
And after the chaos and glory of the following year
Life was restored to mostly normal
Or as normal as it ever really gets around here.

It was understandable though, the impulse with which we seized that year
We had the chance to re-make the fun mistakes we'd been forced to learn from as adults
The only rule for the whole year was that you weren't allowed to do anything important
As the world was no longer wise enough to deal with any catastrophic faults

Thankfully, the sewage system was fully automated, as was a surprising amount of everything else
Decay due to entropy definitely did occur, but it was not as bad as anyone had feared
Sure, there might have been a few extra fatalities, but it was fantastic for the most part
We explored ourselves and the world. Nostalgia would ensure this year was revered

We would remember with wonder the year that we forgot
With no one questioning if it was because there was something we needed to leave behind
No hints were left. We'd successfully wiped out all record of our past selves
Except a clock counting down. It's locking a sealed letter in a transparent safe. We can't wait to see what we'll find...