Randall, there should be plenty of no-shows and cancellations this late in the year, even on a Friday.
Just show up when the no-shows are declared (11 AM), and you will most likely get what you want. They may even have them throughout the rest of the day as well.
But since you already have paid the $15 for the reservations, if you call on the 13th (and maybe even the 14th) they can change your reservations to the 15th if there any phoned in cancellations available. I think switching dates will cost you $10.