I booked two nights on the package when they first were available. I have one for the first night we arrive a Thursday - with a late lunch at the mexican place and the second one for Monday night w/ early dinner at Living Seas. We really wanted to go our first night we arrive, but I booked two, in case we got rained out or missed our flight on the first night. My plan was to cancel, if after seeing it the first night we decided we did not want to see it a second time (with a different narrator).
Now, one of our party is going to have to miss the first day of arrival - so we most likely will go twice so he can see it as well. But, as the dates get closer and I see how the weather is I may cancel the first night instead and do dinner somewhere else.
Remember, people will be charged if they don't cancel within 48 hours, so I would assume as peoples plans change there will be cancellations.
We are going 11/29 - 12/4 - so I can't help you out but don't give up the faith.