No, but thank you for asking! We look forward to spending time with them at a later date.
Generally cocktail attire, but whatever you feel comfortable in. By all means lean into the Southwest aesthetic if it calls to you.
Santa Fe is 7,199 feet above sea level -- the highest state capitol in the US. Like Carolyn, you may experience symptoms of altitude sickness. To help prevent and mitigate this, drink LOTS of water and build in time to rest.
Dry, with highs likely in the mid-80s during the day and cool evenings as low as the mid-50s.
You do not! There are many Airbnbs and other hotels in the area to suit your preferences.