Yeah, it's true. I'm slacking even worse than usual. But, it's better late than never, I guess.
In addition to all of the unlockable goodies that have been added to the PS2 remake of Nights, there are even more date-specific surprises. For the entire month of October, playing in Mystic Forest will give Nights and Claris a Halloween makeover. Nights dons some dark clothing and generally looks a little odd, while Claris plays the part of a complete witch.
Since it's no longer October, you can either wait until next year (which is my plan) or set your date back to last month.
If there are any Thanksgiving surprises, I'll let you know in 2009 (most likely January).