Opening lyrics

It was a long time ago, longer now than it seems
In a place that perhaps you've seen in your dreams
For the story that you are about to be told
Began with the holiday worlds of old
[ Lyrics from: http://www.lyricsmode.com/lyrics/d/danny_elfman/opening.html ]
Now you've probably wondered where holidays come from
If you haven't, I'd say it's time you begun

For the holidays are the result of much fuss
And hard work for the worlds that create them for us
Well, you see now quite simply that's all that they do
Making one unique holiday especially for you

But once a calamity ever so great
Occurred when two holidays met by mistake