Ocean Park Hong Kong, commonly known as Ocean Park, is a marine mammal park, oceanarium, animal theme park and amusement park situated in Wong Chuk Hang and Nam Long Shan in the Southern District of Hong Kong.
 Opened in 1977 by the then Governor of Hong Kong Sir Murray MacLehose, Ocean Park became popular but by 2005 was unprofitable and widely expected to lose out to the new Hong Kong Disneyland.
 However, the Park responded with a HK$5.5 billion development plan that saw it expand to over 80 attractions and rides, and steadily grow visitor numbers to 7.6 million in 2014, making it the world's 13th most visited theme park, and the largest theme park in Asia.
 Half of all visitors now come from mainland China, in growth that parallels rising mainland tourist visitor levels to Hong Kong over the same period.
 Since this high, visitor numbers have declined to around 6 million in 2016 under the background of declining tourist arrivals in Hong Kong.
Wong Chuk Hang Estate () was a public housing estate in Wong Chuk Hang, Hong Kong.
 The estate had ten residential blocks and was cleared in 2007.
 The estate has been replaced by the MTR Wong Chuk Hang Station and Wong Chuk Hang Depot.
A marine mammal park (also known as marine animal park and sometimes oceanarium) is a commercial theme park or aquarium where marine mammals such as dolphins, beluga whales and sea lions are kept within water tanks and displayed to the public in special shows.
 A marine mammal park is more elaborate than a dolphinarium, because it also features other marine mammals and offers additional entertainment attractions.
 It is thus seen as a combination of a public aquarium and an amusement park.
 Marine mammal parks are different from marine parks, which include natural reserves and marine wildlife sanctuaries such as coral reefs, particularly in Australia.
The Hong Kong University Graduates Association College (HKUGAC; ) is an EMI secondary school (English as Medium of Instruction School; Chinese: 香港英文授課中學) located at No.9 Nam Fong Road, Wong Chuk Hang, Hong Kong.
 It was founded in 2006 by the Hong Kong University Graduates Association.
 The Hong Kong University Graduates Association Education Foundation is a registered non-profit-making organization founded by members of the Hong Kong University Graduates Association, alumni of The University of Hong Kong (HKU), and other members of society.
 The foundation consists of nearly 200 members and is managed by an elected Executive Committee.
Tai Shue Wan () is a bay to the south of Nam Long Shan, Wong Chuk Hang, Hong Kong Island, Hong Kong.
 It comprises the Waterfront section of Ocean Park.
Nam Long Shan ( ] ) or Brick Hill is a hill on the Hong Kong Island of Hong Kong, near Wong Chuk Hang and Aberdeen.
 At an elevation of 247 metres, it overlooks the South China Sea in the south, Sham Wan and Aberdeen Channel in the west, and Deep Water Bay in the east.
Wong Chuk Hang () is an elevated MTR rapid transit station in Hong Kong on the eastern section of the South Island Line, built on the old site of Wong Chuk Hang Estate.
 It is named after the locality of the same name and serves residents in that area, as well as connect to a public transport interchange on a widened section of Heung Yip Road.
 A network of footbridges serves future commercial and residential areas, and the station exists as a hub to the Shum Wan region as a whole.
 The station opened on 28 December 2016 with the rest of the South Island Line.
 The South Island Line depot is located to the south.
Shouson Hill () is a hill (approx 150 m high) on the coast of Deep Water Bay east of Wong Chuk Hang on Hong Kong Island in Hong Kong.
 It is also an upmarket residential area located just to the north of the hill.
 The area consists primarily of Shouson Hill Road, a loop off the main Wong Chuk Hang Road, together with a few side roads.
Aberdeen Tunnel () is a two-tube tunnel linking Happy Valley and Wong Chuk Hang near Aberdeen on the Hong Kong Island, Hong Kong.
 It shortens the travel time between Wong Chuk Hang and Causeway Bay of the Hong Kong Island.
 It connects the Wong Chuk Hang Road and Canal Road Flyover in the Hong Kong Island.
 The toll plaza is at the Wong Chuk Hang end.
Ocean Park Halloween Bash (海洋公園哈囉喂) is an annual Halloween event held by Ocean Park Hong Kong.
 It contains haunted attractions and shows, the park area is decorated with Halloween decorations and full of Halloween characters that are dressed up by the officials.
 The Halloween Bash in Ocean Park started in 2001 and it held during late September to 1 November each year.
 It has changed to All-Day-and-Night Halloween Celebration in 2013.

Question: What year did Ocean Park Hong Kong,a marine mammal park, oceanarium, animal theme park and amusement park situated in Wong Chuk Hang and Nam Long Shan in the Southern District of Hong Kong, change its Ocean Park Halloween Bash to  All-Day-and-Night Halloween Celebration?
Answer: 2013