If it is a repeatable crash send a copy of the save to Paradox following the directions in the sticky thread about bug reporting.
Sometimes one can get past places like this by playing a small out of the way nation until you get past that date then reloading the game as the nation you want to play.
Sometimes one can get past places like this by playing a small out of the way nation until you get past that date then reloading the game as the nation you want to play.