He and his campaign are pushing the rock star atmosphere around the candidate.

Borrowing from the political repertory of John F. Kennedy, Senator Barack Obama will accept his party’s nomination outside of the main Democratic convention hall this August, in the Denver Broncos’ football stadium that seats more than 75,000 people.

Mr. Obama, who will be the first African-American presidential nominee for a major party, will give his acceptance speech at Invesco Field on Aug. 28, the 45th anniversary of the Rev. Dr. Martin Luther King’s “I Have a Dream” address. And he will be the first nominee to give his speech outside the convention hall since Kennedy did so in 1960, when he drew a crowd some estimated at 50,000 at the Memorial Coliseum in Los Angeles.

Though clearly enticed by what they believe will be a powerful television image of Mr. Obama speaking before tens of thousands of people, his aides said Monday that they hoped to open the convention to regular voters who typically did not attend party conventions. The Pepsi Center, with a capacity of 21,000 people, would accommodate only the usual convention crowd, party officials said.

Bet there will be a bunch of people praying for no rain and the Repubs will be asking for a storm.