It's not too late to see the freak Comet Holmes. Although if you wait too much longer, it may be. It has gotten so big and diffuse that, as bright as it is, it can be hard to see without binoculars -- especially when the moon is up (which will be less of a problem over the next few days). But it is still visible from my only-moderately dark location. And with binoculars, it is incredibly obvious.
For more info on this old comet that suddenly and unexpectedly "exploded" and became immensely brighter than usual, see this Sky and Telescope article from November 15.