According to NASA, the world will not end on St Lucy's Day*. I'm going to stick my neck out and believe them.
It's the original cognitive dissonance scenario: celebrate instead with this classic sketch.
And just carry on...
* This dating may not work any more, although it would be a pity to lose it; Donne was of course writing before the calendar adjustment of 1752.... Still, 21 December 2012 seems to be the deadline.