The Buzz Under The Stars KCMO date is only for The Offspring and Alkaline Trio. They are playing with Anberlin, The Used, and Taking Back Sunday (sort of a merger between two big tours one could say). Unfortunately the rest of the bands mentioned in the news article above won't be there.
I think some people aren't understanding this. All the bands aren't going to be together on any date, they are taking turns supporting.
Alkaline Trio & Street Dogs will support 5/19/09-6/9/09 on headlining dates.
Shiny Toy Guns & Street Dogs will support 6/10/09-6/17/09.
Dropkick Murphys will support 6/19/09-6/30/09.
Pennywise will support 7/2/09.
Sum 41 will support 7/10/09-7/18/09.