Nevermind... these things fill up fast. The 9:00 option for the 23rd is gone now. So we'll leave it as is - it's about the only decent time in the middle of the week that we're going to get.
The only other choice at this point that I see is a forum draft - which we don't want to do.
So, we're currently set for August 29th, 10:30 CDT.
There is still a 9:00 CDT option for the Tuesday the 22nd as well - but who knows how long it will be available, and I'm hesitant to switch for fear of losing the slot we have.