Question: How many people were at Disneyland on opening day?
About the article "Disneyland", section "Opening day".

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On Sunday, July 17, 1955, Disneyland hosted a live TV preview, among the thousands of people in attendance were Ronald Reagan, Bob Cummings and Art Linkletter, who shared cohosting duties, as well as the mayor of Anaheim.
Walt gave the following dedication day speech: 
Opening in 2015, Shanghai Disneyland Park will feature a "Toy Story Land" on opening day.
Unlike the two existing versions of this "land", it will only feature two rides, minus the "Toy Soldiers Parachute Drop" attraction found at Walt Disney Studios or Hong Kong Disneyland. 
The Disneyland Railroad (DLRR), originally the Euro Disneyland Railroad (EDRR), is a narrow gauge railroad at Disneyland Park at the Disneyland Paris Resort in Marne-la-Vallée, France that was inaugurated on the park's opening day, April 12, 1992.
Riders use it as transportation to other areas of the park or simply for the experience of the "Grand Circle Tour". 
Big Thunder Mountain Railroad was designed by Imagineer Tony Baxter and ride design engineer Bill Watkins.
The concept came from Baxter's work on fellow Imagineer Marc Davis's concept for the Western River Expedition, a western-themed pavilion at the Magic Kingdom, designed to look like an enormous plateau and contain many rides, including a runaway mine train roller coaster.
However, because the pavilion as a whole, was deemed too expensive in light of the 1973 construction and opening of Pirates of the Caribbean, Baxter proposed severing the mine train and building it as a separate attraction.
The Big Thunder Mountain Railroad project was put on hold again in 1974 as resources and personnel were being diverted to work on constructing Space Mountain over in Tomorrowland, but this delay may have ultimately produced a smoother ride as the use of computers in attraction design was just beginning when the project was resumed.
Big Thunder Mountain Railroad was one of the first Disney rides to utilize computer-aided design.
The attraction first opened at Disneyland in 1979, with the Magic Kingdom's larger version in Florida opening in 1980.
Tokyo Disneyland added its own version in 1987 and in 1992, "Euro Disneyland" (now named Disneyland Paris) opened with Big Thunder Mountain as an opening day attraction. 
Disneyland was dedicated at an "International Press Preview" event held on Sunday, July 17, 1955, which was only open to invited guests and the media.
Although 28,000 people attended the event, only about half of those were actual invitees, the rest having purchased counterfeit tickets.
The following day, it opened to the public, featuring twenty attractions.
The Special Sunday events, including the dedication, were televised nationwide and anchored by three of Walt Disney's friends from Hollywood: Art Linkletter, Bob Cummings, and Ronald Reagan.
ABC broadcast the event live, during which many guests tripped over the television camera cables.
In Frontierland, a camera caught Cummings kissing a dancer.
When Disney started to read the plaque for Tomorrowland, he read partway then stopped when a technician off-camera said something to him, and after realizing he was on-air, said, "I thought I got a signal", and began the dedication from the start.
At one point, while in Fantasyland, Linkletter tried to give coverage to Cummings, who was on the pirateship.
He was not ready, and tried to give the coverage back to Linkletter, who had lost his microphone.
Cummings then did a play-by-play of him trying to find it in front of Mr. Toad's Wild Ride.
Traffic was delayed on the two-lane Harbor Boulevard.
Famous figures who were scheduled to show up every two hours showed up all at once.
The temperature was an unusually high , and because of a local plumbers' strike, Disney was given a choice of having working drinking fountains or running toilets.
He chose the latter, leaving many drinking fountains dry.
This generated negative publicity since Pepsi sponsored the park's opening; disappointed guests believed the inoperable fountains were a cynical way to sell soda, while other vendors ran out of food.
The asphalt that had been poured that morning was soft enough to let ladies' high-heeled shoes sink into it.
A gas leak in Fantasyland caused Adventureland, Frontierland, and Fantasyland to close for the afternoon.
Some parents threw their children over the crowd's shoulders to get them onto rides, such as the King Arthur Carrousel.
In later years, Disney and his 1955 executives referred to July 17, 1955 as "Black Sunday".
After the extremely negative press from the preview opening, Walt Disney invited attendees back for a private "second day" to experience Disneyland properly.
The next day, crowds gathered in line as early as 2:00 am.
The first person to buy a ticket and enter the park was David MacPherson with ticket number 2, as Roy O. Disney arranged to pre-purchase ticket number 1 from Curtis Lineberry, the manager of admissions.
However, an official picture of Walt Disney and two children, Christine Vess Watkins (age 5) and Michael Schwartner (7), inaccurately identifies them as the first two guests of Disneyland.
Both received lifetime passes to Disneyland that day, and MacPherson was awarded one shortly thereafter, which was later expanded to every single Disney-owned park in the world.
Approximately 50,000 guests attended the Monday opening day.