The promoters claimed that 54,000 people attended the event other officials estimated the crowd between 20,000 and 30,000 .
The event would have set a new attendance record for a mixed martial arts event in the United States ; however .
The promoters claimed that 54,000 people attended the event , which would have set a new attendance record for a mixed martial arts event in the United States ; however , other officials estimated the crowd between 20,000 and 30,000 .