What is Howl'o'ween? Selected dates from 13th to 31st October 2018. Spooky family fun, rides in the dark, Zoo and SEA LIFE centre and spine-tingling Halloween attractions. Keep an eye on our website for more details! Related articles Do you offer a 2 day ticket? What are your Opening Times? Do I get a discount on Fastrack tickets as a Merlin Annual Pass holder? What are the Chessington World of Adventures Pass terms and conditions? Do you offer Corporate and Conference Event facilities?