None of the other Crossroads shows are anywhere near as big as SAR.
If you think of the buildings, generally speaking only the one on the left from the gate and the first one to the right will be full, and that right one typically is a bit sparse. The one in the back will generally not be in use, but the tent right in front generally will be.
That said, dead middle of summer shows tend to be even smaller, and that tent might not be in use (and at the very least, you won't want to be there long). Fewer vendors, and sometimes they move into the Coliseum because the Aircon is better, though I don't see any news of that on the website. Those ones are the smallest.
I've been to all of them, and while they're hit & miss except for SAR, the summer ones are the smallest of the shows. You also have to remember that this time of year, anyone who can get out of the Valley... does. And the snowbirds are gone.
That doesn't mean it'll be bad, or there won't be anything good, just that this is probably going to be one of the smallest ones of the year for a Phoenix Crossroads show. Still bigger than the non-Phoenix crossroads shows, though.