A press conference happened on February 24 , 2009 at the University of Phoenix Stadium to officially tell people about the event for Glendale , Arizona at the University of Phoenix Stadium ; this event is the first time WrestleMania would happen in the state of Arizona . A press conference was held on February 24 , 2009 at the University of Phoenix Stadium to formally announce the event for Glendale , Arizona at the University of Phoenix Stadium ; this event marked the first time WrestleMania has been held in the state of Arizona .