I belong to NASA Central Region - but I found this for the NASA Arizona Region - about as close to LV as I could find:
http://www.nasaaz.com/
May 31: (Sat early AM 1/2 day only) – Wild Horse Pass (WHP) West Track - no points “race”
July 12 & 13 – Willow Springs (crossover points event with NASA So Cal)
August 29, 30 & 31 - East Coast National Championship (Road Atlanta) – no points
October 11 & 12 – INDE Motorsports Park - Arizona