Cocktail attire and be prepared to dance!

I think you already know the answer... YES!

If you stay at the San Marcos, there is no shuttle, but is definitely within walking distance. If you are staying at the Hilton, they do provide a shuttle

It is Arizona and coming off our summer months, but it is possible that it will cool down but any out-of-towners, feel free to leave those coats home! You likely will not need them :)