I need to define weekly appointments, except during the school holidays. I know org-class provides a way to exclude some weeks from recurring events but I was wondering if some clever use of sexp would make it possible to use the weeks/days of holiday from a public ical calendar (like https://www.google.com/calendar/ical/bubn5utkn054pluh4v44nu6ok62e1dbo%40import.calendar.google.com/public/basic.ics).
Did somebody ever try it ?
