I don't think that the T shirt you are referring to , was actually a SF  official product but a private venture by a   group member . 
        It was done with the consent of the flipee , who actually has a great sense of humor and takes it in stride . 
        There were actually numerous shirts , hats and tire covers that had no connection with the organizers .The only shirts that were official were the volunteer shirts .
         I hope your shirts sell well and you event turns out as you anticipate .The Bus movie was spectacular , I know all of the attendees will enjoy it .

Kindest regards 
-Stacy