The cancellations are real and can't just be explained by the weather, because some of the events were indoors. They've disappeared from the official website schedule, but beyond that it's all guesswork.
As other people have pointed out, Palin isn't being allowed out solo, which is just slightly unusual for an election.
Either way, I'm grateful to McCain. Palin's-mother-from-Bobby's-World accent makes me want to throw things at my teevee, so not having to listen to her is welcome. Conservatives want live babies so they can raise them to be dead soldiers. - George Carlin