not the event itself, but the evidence of it having happened or not is accessible. Likewise a forensic investigator doesn't recapture the event, but reconstructs potential reasonable scenarios. Does he prove that X killed Y? Not in the same way that we can prove a**2 +b**2=c**2, that is why the legal system has different levels of evidence, 'beyond reasonable doubt' are the wiggle words to pay homage to the problem of induction and the problem of the historical sciences, like forensics.

so do we have access to the event?
no.
do we have access to evidence that the event might have left? yes.