My theory is...
either they wanted to do Milwaukee this time, in lieu of Chicago (we don't know for sure if Tech can actually pack both cities on the same tour)
or...KMK beat Tech to that Sept 18th HOB date lol. either way, I don't completely miss Pearl Room. Tech would've never had a sold out show. That Sickology 101 show, for example, would've had a great turnout (with Murs being on it too) in the city. But, it was in Mokena, and the attendance sucked.