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?
Sentence (from "Ocean Park Hong Kong"): 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.
Relevant evidence: No