Curnow's Visit is a written note found in Dishonored.
Captain Curnow and his retinue will be here this evening. See that they are allowed through the checkpoint without incident. I would like him in a fair mood when I have drinks with him in the meeting chamber.
Also, be prepared to defend the checkpoint from the inside should things go awry with negotiations. Not that I expect they should, but I want your Overseers prepared in case Curnow and his men live up to the City Watch's reputation.