According to wikipedia, the event was held at the Xcel Energy Center, according to wikipedia, it says that the record attendance was 19,434. How would they fit 22,000 people there?
The DNC was held at the Pepsi Center which holds 19,309.
So the Republic Natioanl Convention holds more people, however since theres no need for a basketball court or anything and it's just a podium, they could probably fit an extra 1000 people or so. Makes me wonder if the DNC used a wide angle lense to make the place look much bigger than it really was?
I was at a WWF event in 2001 at Rosemont in Illinois, and I remember watching the screens, the arena looked a lot bigger than it really was on tv because of the wide angle lens stretching everything which made the arena look much bigger.