Afaik:
They do this every year. Pose as some other fictional group; enter dressed as the other team's fans, then reveal themselves as Krush after the game starts.
This year they called themselves the Illinois Chapter of the Boys and Girls Club; which does not exist. It is a fictional group. There are "Boys and Girls Clubs of 'fill in a location'." There is also "The Illinois Alliance of Boys & Girls Clubs."
Iowa implied they obtained a discount by posing as a charity. That is false. The discount is available to any group of 20 or more. Besides, Krush is a 501(c)3 origination.
The tickets were purchased in October. Buses were chartered for 200. Individuals booked hotel rooms. Iowa waited until yesterday to cancel the tickets.