Even if you are not regular opera fans, you might consider going to the Santa Fe Opera on one of your evenings.
The theater is a (mostly) covered open-air facility, whose wall-less sides allow the nighttime sky to become part of the ambiance:
They're doing "Carmen" during your dates, a very accessible work, and as usual for Santa Fe, the singing and production values are at a high international level.
http://www.santafeopera.org/tickets/...nceNumber=6294