The SARA launch this past weekend was low-mid power only, due to the heat, and lack of leadership support. There were a few 'G' flights, but mostly Estes stuff.
I would try the superstition spacemodeling society outside of Phoenix, but I think most of the AZ launches are on hold, or very light attendance during the hot summer months.
Also, the recovery field at the SARA site is very limited, so if you have a small carbon bird, there is a good chance you'd lose it. My son lost his E powered rocket there last year