Paizo is always coming out with new, free content for their games. That includes this new Pathfinder encounter that you can drop into your games. Adventurers tend to wind up in the sketchier parts of town. Most of the time, it's no big deal. But occasionally, it is.
From the post:
Few things are more challenging for a Game Master than creating an encounter on the fly, but one of those more-difficult tasks is making an impromptu encounter set in a crowded city street packed with all manner of details you have to draw on the map before the players start to lose interest. Luckily, Pathfinder Flip-Mat Classics: Red Light District is available now, so you’ll never again need to sketch out winding alleys, interior locations of ill repute, or a canal of questionable cleanliness. While this map is by no means necessary to run the following encounter (designed by Vanessa Hoskins), they certainly go well together!