There are two conventions during that time period. One at the very beginning (ending on the 29th) and one at the very end (beginning August 5th).
Remember, many people coming to Disney for a conference pad their reservation with either days before or days after their conference (or both) in order to enjoy the parks and/or resort - especially if their family is coming along.
So, the resort might very well be booked. But that doesn't mean it will be crowded. As PP said, many convention goers will be busy, conventioning.
I know when I go to CSR of a conference, I am pretty busy during the day.
Also, keep checking as you get closer to the time you want to arrive. Many times conventions will have a block of rooms reserved until a few weeks before their convention that will be released. Also, crap happens and people wind up canceling because they can no longer go to the convention.
In any case, you will have a great time. Don't let the conventions scare you. I actually hope for conventions (but not Granger!) during my CSR stay.