A look at the extended weather forecast for Las Vegas next week shows the POSSIBILITY of some icky weather. Now we all know how fickle Mother Nature can be AND the track records of weather people, so take this with a grain of salt, but depending on which weather site you look at, there is a CHANCE of rain mid-week and night time temps in the low to mid 50's. This isn't meant to alarm anyone, just something to keep in mind while packing. Maybe a lil heavier jacket, some jeans, and perhaps an umbrella wouldn't be the worst idea in the world.
Me personally, I think the party gods will feel our collective fabulousness and we'll be fine, but better safe than sorry!