The Calendar

I love the calendar, really, I do. The only thing I do not like about it is the very moment you go to a new game, you have to do a new calendar with all you want in it again. I always put in all school holidays (in Germany we have 4 big school holiday times of about 1-2 weeks each!), all Christian ones and national ones also. Together with birthdays, it makes me work about 1-2 hours before I am able to play. Hm! Well ...
Who is able to take care of that? Or, who has the confidence to mod a calendar that is, well, copyable? From one game to another? I'd die for having such a tool. Or ... is this ... IMPOSSIBLE ??? :#