Clothing picked out for Vegas - I think

I've been sorting out the things that I will wear to the seminars and it is starting to really drive me insane since I am not sure just what the weather will be like in Vegas. I know it is a dry heat, so it's hard to pick out stuff that will be cool, and yet not so cool it will leave me cold at night if the temperature drops. I think I have some nice outfits picked out now though, and I just need to find me a good pair of dress type shoes rather than the walking shoes I have. They will do in a pinch, but I'd rather find some nice low side boots or something that I can wear as an alternative shoe style.