Question: When was Disneyland dedicated at an "International Press Preview"?
About the article "Disneyland", section "Opening day".

Candidate passages:
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.
The actual day of Disneyland's 50th Dedication Day/Press Preview was an event marked by fans' enthusiasm.
The first person to enter the park that day was Madison Steigerwald, a 16-year old girl from Old Greenwich, CT. She and her grandmother, Mary Madison, began to line up at 3 p.m. the day before.
Due to the thousands of fans that continued to line up through the night, Disney California Adventure Park was opened and housed everyone until the next morning.
A second line formed outside the security checkpoints as thousands more arrived in the final hours before the park opened.
Disneyland Park opened at 7:00 a.m., although it took several hours to admit the crowds that showed up that morning. 
Motor Boat Cruise was an attraction at Disneyland in Anaheim, California. 
Hollywood Boulevard is a "studio lot" at Walt Disney Studios Park in Disneyland Resort Paris.
Designed by Walt Disney Imagineering, the project falls under their "placemaking" banner of park improvements and expansions, adding theme and timezones to existing park areas.
Hollywood Boulevard uses land formerly classified as part of Production Courtyard for a new development of "street sets", an outdoor food court and a major new attraction.
The project was formally announced to the press on 1 April 2007, including the preview of one piece of "concept art", for an initial, unused vision of the Boulevard. 
  In 2000, 2002, 2003, it was rumored that the construction of a park known as "Shanghai Disneyland" would begin in 2005, and be completed in 2014.
This was originally denied by Hong Kong International Theme Parks President Bill Ernest.
On December 5, 2007, the assessment agency reported that construction of "Shanghai Disneyland" would start after the Expo 2010 Shanghai China, with an investment amounting to 40 billion yuan.
On March 7, 2008, Ming Pao Daily News reported that Disney's first choice for construction was in Pudong, Shanghai.
November 1, 2009: While attending the 21st session of the International Business Leaders Advisory Council, Han Zheng, Mayor of Shanghai said, in response to the media's questions: "Shanghai Municipal Government will, in the near future, convene a special press conference to release the latest and to answer your questions.” Some people say that the "Shanghai Disneyland" project was approved in October 2009, but due to the low-key style of the Shanghai Municipal Government, and the need to fine-tune details between the two sides, as well as the need to change the 4 regulations, so subject to 100% to determine the rear will be publicly announced.
At 8:30 on November 4, 2009, an announcement, authorized by the Shanghai Municipal Government Press Office, was made: "Shanghai Disneyland project application report has been approved by the relevant state departments.
Estimated total investment of 24.4 billion renminbi."
Land near the proposed production site increased in value dramatically after the announcement was made.
January 18, 2011 A mainland government official today has confirmed that Shanghai Disneyland which is scheduled now to open in 2015 will be 2-3 times the size of Hong Kong Disneyland and will eventually contain three theme parks.
Speculation is that these three theme parks will include parks based on Magic Kingdom, Epcot and Animal Kingdom.
April 7, 2011 Groundbreaking begins at the Shanghai Disneyland Resort site.