Question: How many people came to the speech "I have a dream"?
About the article "Lincoln Memorial", section "Sacred space".

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"I Have a Dream" is a 1963 speech by Martin Luther King, Jr.I Have a Dream may also refer to:  "I Have a Dream" (oratorio), a 1970 oratorio by James Furman  "I Have a Dream" (song), a 1979 song by ABBA, covered by many artists  "I Have a Dream"/"Bellissima", a 1997 song by DJ Quicksilver that samples King's speech  "I Have a Dream" (EP), an EP by Group 1 Crew  "I Have a Dream", a 1974 album by Solomon Burke, or the title song  "I Have a Dream", a song by Herbie Hancock from "The Prisoner"  I Have a Dream Foundation, founded by Eugene Lang  
The song "I Have a Dream" samples on the famous "I Have a Dream" speech by Martin Luther King and uses excerpts from King's voice. 
Lincoln's Lost Speech was famous, with a status considered legendary by the time Tarbell became enamored with Whitney's version of it.
Lincoln was said to have spoken "like a giant inspired" and the tale of how the speech came to be lost was well known.
Many who attended the speech considered it the greatest of Lincoln's life.
Given at the first state convention, which essentially founded the Illinois Republican Party, the speech thrust Lincoln into the national political limelight.
Though it was known as the Lost Speech, its content influenced people nonetheless.
Those who heard it were often asked to repeat what they heard and a frenzied group of supporters spearheaded Lincoln's drive toward a second place finish among U.S. vice presidential candidates in 1856. 
On internet freedom day, EMI evoked much controversy and anger after the removal of Martin Luther King Jr's "I have a dream" speech due to copyright violation. 
King had been preaching about dreams since 1960, when he gave a speech to the National Association for the Advancement of Colored People (NAACP) called "The Negro and the American Dream".
This speech discusses the gap between the American dream and reality, saying that overt white supremacists have violated the dream, but also that "our federal government has also scarred the dream through its apathy and hypocrisy, its betrayal of the cause of justice".
King suggests that "It may well be that the Negro is God’s instrument to save the soul of America."
He had also delivered a "dream" speech in Detroit, in June 1963, when he marched on Woodward Avenue with Walter Reuther and the Reverend C. L. Franklin, and had rehearsed other parts.
The March on Washington Speech, known as "I Have a Dream Speech", has been shown to have had several versions, written at several different times.
It has no single version draft, but is an amalgamation of several drafts, and was originally called "Normalcy, Never Again."
Little of this, and another "Normalcy Speech," ends up in the final draft.
A draft of "Normalcy, Never Again" is housed in the Morehouse College Martin Luther King, Jr. Collection of the Robert W. Woodruff Library, Atlanta University Center and Morehouse College.
The focus on "I have a dream," comes through the speech's delivery.
Toward the end of its delivery, noted African American gospel singer Mahalia Jackson shouted to King from the crowd, "Tell them about the dream, Martin."
King stopped delivering his prepared speech and started "preaching", punctuating his points with "I have a dream.
"The speech was drafted with the assistance of Stanley Levison and Clarence Benjamin Jones in Riverdale, New York City.
Jones has said that "the logistical preparations for the march were so burdensome that the speech was not a priority for us" and that "on the evening of Tuesday, Aug. 27, hours before the March Martin still didn't know what he was going to say".
Leading up to the speech's rendition at the Great March on Washington, King had delivered its "I have a dream" refrains in his speech before 25,000 people in Detroit's Cobo Hall immediately after the 125,000-strong Great Walk to Freedom in Detroit, June 23, 1963.
After the Washington, D.C. March, a recording of King's Cobo Hall speech was released by Detroit's Gordy records as an LP entitled "The Great March To Freedom."