Question: What was the estimated number of fans that came to the plaza?
About the article "What Makes You Beautiful", section "Live performances".

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Theatre event engineering company "Redmoon Theater" had sight installations all along State Street that culminated in a roving performance with a final show in Daley Plaza that featured the capture of human-sized rat that was locked in a rat wheel that set off pyrotechnics before an audience estimated to number 15,000.
Musical ensemble "Mucca Pazza" performed at Looptopia on the Daley Plaza stage. 
On July 12, 2012 the Sabres announced that the plaza adjacent to First Niagara Center would be re-branded Alumni Plaza.
On October 12, 2012, a bronze French Connection statue was added to the plaza.
Other plans included plaques with the name of every player to play a game for the team and fans having to opportunity to buy engraved bricks. 
One Direction performed "What Makes You Beautiful" on "Red or Black?"
on 10 September 2011.
The performance started with hosts Ant & Dec announcing that the band was supposedly running late for their appearance, and cut to a video of One Direction boarding a London Tube carriage full of fans, as the studio version of the song began playing.
Each fan on the tube was given a numbered ticket.
The band and fans disembarked the tube and made their way to the television studio, where the remainder of the song was sung live.
After the song, Styles caught a numbered ticket raining onstage.
The number corresponded to a ticket held by a fan from the tube; the colour of the fan's shirt was the correct answer for the "Red or Black?"
challenge.
The band performed "What Makes You Beautiful" and its B-side, "Na Na Na", at the BBC Radio 1 Teen Awards on 9 October 2011.
The band also performed the song to open telethon "Children in Need 2011" on 19 November 2011.
One Direction performed "Gotta Be You", "One Thing", and "What Makes You Beautiful" at Capital FM's "Jingle Bell Ball" on 4 December 2011, at The O2 Arena.
They performed a medley of "She Makes Me Wanna" and "What Makes You Beautiful" with JLS on the "The X Factor" eighth series final on 10 December 2011.
The group performed "One Thing" and "What Makes You Beautiful" on "Dancing on Ice" on 5 February 2012.
In Italy, the group performed "What Makes You Beautiful" at the 2012 Sanremo Music Festival on 14 February 2012.
In France, they performed "What Makes You Beautiful" and "One Thing" on "Le Grand Journal" on 22 February 2012.
In the United States, One Direction performed "What Makes You Beautiful", "More than This" and "One Thing" on "The Today Show" at the Rockefeller Center on 12 March 2012.
An estimated 15,000 fans descended on the plaza.
They also performed "What Makes You Beautiful" at the 2012 Kids' Choice Awards on 31 March 2012.
One Direction performed "What Makes You Beautiful" and "One Thing" on comedy television show "Saturday Night Live" and also appeared in a comedy sketch with Sofía Vergara on 7 April 2012.
In Australia, they performed "One Thing" and "What Makes You Beautiful" at the 54th Logie Awards, where they also presented an award for "Most Popular New Female Talent" on 15 April 2012.
On 12 August 2012, One Direction performed "What Makes You Beautiful" at the 2012 Summer Olympics closing ceremony in London, which represented the handover to Rio de Janeiro as the host of the 2016 Summer Olympics. 
The plaza has long been a politically important space.
It was a strategic location during the three-day April insurrection that won the 1952 Revolution.
Following the dictatorship years of 1971–82, elected president Hernán Siles Suazo came to the Plaza first upon returning from exile.
In the 2003 Gas War, the plaza was the central gathering place for crowds opposing the privatization of Bolivia's gas resources and demanding the resignation of President Gonzalo Sánchez de Lozada. 
The Plaza is the largest shopping centre in the Manawatu-Wanganui region and a key shopping centre in the lower North Island, boasting over 100 stores.
It was built in about the 1970s to the 1980s and then upgraded again in around the late 2000s to what it is now.
In the opening week of the upgraded plaza people came from all over the North Island to have a look around.