But how do you know that it has taken place without the light reaching you?
Without the light (or radiation), all you can say is that "something may have taken place everywhere".
Without the light (or radiation), all you can say is that "something may have taken place everywhere".
Then there’s ER=EPR to try to conceptualize.
Whether/when I "know" about it is separate, and not what they're talking about.
The OP was referring to when a event happened though.
For the sake if the argument let's allow this body to be an light-hour away from us when it happened.
I think your logic is very weak here.
Things happen without us knowing about it, and without light from such events ever reaching us. We don't need to know it has happened for it to have happened.