You can now display the time till an event is called via PlaceholderAPI
"%calendarevents_until:myEventLabel%" returns time in d h min s
"%calendarevents_until-s:myEventLabel%" returns time in s
"%calendarevents_until-min:myEventLabel%" returns time in min
"%calendarevents_until-h:myEventLabel%" returns time in h
"%calendarevents_until-d:myEventLabel%" returns time in d