I spotted this advert for a Halloween menu for the Ikari restaurant on Facebook. I contacted the phone number (golf hotel reception) and asked about whether the menu was just for one night.
The guy who answered said that this menu is available for certain on Saturday 28 October and Tuesday 31 October 2017. It might also be available on Friday 27 October although he was not sure about this. Also, he said that if there is a big enough group of people wanting it they will serve the menu on any night close to Halloween.
He said the restaurant opens at 8pm in the evening and for lunch on Sundays (probably not serving the menu at that time and also probably not on Sunday evening). The restaurant is closed on Mondays.