More than 84,000 people packed inside Obama's (D-Ill.) speech at the Democratic National Convention, a city official said.

That figure was based on the number of credentials scanned by security officers as delegates, citizens and news media paraded into the football stadium hours before Obama accepted the Democratic Party's presidential nomination, said Nancy Kuhn, a spokeswoman with Denver's public works department.

The Denver Broncos' home stadium normally holds 76,125 people, but more seats were placed on the field for the event, said Kuhn, acting as a spokeswoman for a multi-agency information center set up for the Democratic National Convention. A final tally wasn't immediately available.

As early as 2 p.m., a huge stream of people stretching for at least a mile could be seen walking toward the stadium. It took about 45 minutes for many people to get through security into the stadium.

People in shorts, flip-flops, sneakers and sandals lined up two- and three-deep in the long line trying to get into the Denver Broncos' football stadium.

"This is going to be the event of a lifetime. I'm ecstatic to be here," said grocery worker Susan Murphy of Denver, who got her Obama speech credential from the United Food and Commercial Workers Union.

Vendors sold Obama T-shirts, posters and even Obama foam fingers, the type usually seen at football games. Most celebrants wore Obama gear and had their Obama campaign "community credentials" hanging from their necks - a coveted ticket obtained via Internet registration or through their work as Obama supporters.

A pair played guitar and bongo drums, adding to the festive atmosphere. Inside a security checkpoint, a drum line from Denver's East High School played and led the crowd in cheers of "Obama!" They wore red Democratic National Convention T-shirts.

John Vialpando of Arvada, Colo., a Republican and a hedge fund trader, scored a credential, as did his brother, Tim, a teacher.

"This is history. I don't care if you're Republican or a Democrat," said John, 27.

Tim Vialpando, 28, is a Democrat and a teacher who wore a National Education Association T-shirt to the event.

"I think there's a glimmer of hope that he'll see the light tonight," Tim said of his brother. "He was very impressed by the Clinton speeches."

With the threat of dehydration ever-present in the sun and mile-high high altitude, city officials used a fire hydrant to replenish a truck dispensing water to the thirsty crowd. One company handed out free bottled water.

There were at least two checkpoints at the tightly controlled venue: One to get onto the stadium grounds, and another to get to the blue-and-orange seating of the stadium itself. Transportation Security Administration workers staffed a tent where people passed through more than a dozen metal detectors.

Once inside, many took pictures of a panorama that included the signature bucking Bronco atop the stadium and the Denver skyline.

Joni and Nick Fisher of Platteville, Colo., were thrilled when they got their tickets: Row 6, Section 123, right at the 50-yard line for a Broncos game - and perfect for viewing Obama's center-stage speech.

But when they got there, they found their seats were behind the stage. They stared at a black curtain and rigging holding up lights and cameras.

"Surprise! We'll get to see him on the Jumbotron," Joni Fisher said. "It's OK. We're here. It's history."

The move to INVESCO Field means many changes for Denver, including the closure of Interstate 25 starting at 5 p.m. between Interstate 70 and 6th Avenue. Click here to read more about the road closures.

The highway is expected to remain closed until at least 9 p.m.