Well obviously you can assign probabilities to anything - but if the event is sufficiently vague, doing so in public is rather pointless - since no one else will know what event you are talking about.

I see that others have made the same complaint in this thread - e.g. Richard Loosemore:

before deciding exactly how many angels can dance on the head of a pin, you have to make sure the "angel" concept is meaningful enough that questions about angels are meaningful