I always check in with the intended hotel a few days prior to arrival. Today I checked early, as I wanted to cancel, as we got a better offer with a friend who was going to cancel hers and give it to us. Her place was closer to the venue and a better place. So, I phoned the Westin, where we reserved over a month ago, only to find they had no record of us.
Thankfully, for any time for this to happen, it would be this time. Otherwise, we may have been screwed out of a decent location.