Errata:

None.

Solution:

The puzzle pieces fit into the given 8x8 grid, as shown below:

When read horizontally, the grid comprises of 8 dates in the format dd/mm/yyyy, when a president survived an attempt on their lives (hence the name). Either “assassination” or “presidents” works for the link.

The blacked-out cells (marked above by blue text), when taken in order and read using A1Z26, reads “reprieve”, the password.