That isn't a huge show by Vegas standard, but big enough. Normally conventions mean that room rates are quite high, especially near the location of the convention.
However July and August are slow times in Vegas due to the heat and there are usually good rates to be had.
Promo codes and offers won't come out until 2-3 months ahead if you are thinking of booking direct with the hotel.
What hotel(s) are you thinking of and what rates are you getting at the moment? Remember that rates normally double or more for Friday and Saturday night.
luci