The National Western Stock Show returns Saturday with its future in Denver now assured. But while the venerable livestock event is not leaving town as it once considered, it still faces many challenges in its second century. Cathy Proctor reports in this week's Denver Business Journal about improvements that people who come to the stock show for a living -- livestock exhibitors and vendors -- want to see. DBJ subscribers can read her report here. And Proctor talked about the stock show and its…