Keep a shoe polish kit in or around your desk. The shoe polish kit is your best friend, because if you turn up at my meetings with scuffed shoes, I will judge you, and you will be found wanting.
In all seriousness, the last minute meeting is in many ways the ultimate test for a Suit, and you need to be ready for anything. It's not quite the same, but quite recently one of my Account Managers turned up for a client meeting in jeans (leaving aside any debate as to whether or not Suits should always be suited, this was definitely inappropriate). Rather than sulk because he wasn't allowed to come to the meeting, he went out and bought a new suit, shirt and shoes. And was judged, and applauded, accordingly.
