On investigation the calendar contains a small bottle for each day leading up to the obviously mega drunken event. The bottles contain just enough to leave you desperate for more and so are probably intended to send you scuttling off to the nearest Waitrose.
Whatever happened to the days when Christmas was all about baby Jesus, goodwill to all and a Satsuma in the Christmas stocking. Perhaps next year John Lewis will also do a vaping calendar with a different flavour for each day and even a cannabis one for their Canadian clientele.