DIY: Save-the-Date Compres

I have been bugging the Other Guin to make our Save-The-Date card since June, but since he had a bunch of projects to finish (means more moolah for the Cosa Nostra), he only had the time to make them two weeks ago.  My idea was to make it look like a pass or an invite card for a Speakeasy pub. No names, just the date, and something that implies mafia.