Unlock Frankenbart:
To unlock a Halloween version of Bart Simpson, set your GameCube's
date to 10/31. Bart will appear as Frankenstein on the character select
screen (under the ? category).
Unlock Marge the
Pilgrim:
To see Marge all gussied up like a Pilgrim, set your GameCube's date to
Thanksgiving day (November 22). Marge will be selectable at the
character select screen.
Unlock New Year's
Krusty the Clown:
To unlock a special holiday outfit for Krusty, set your GameCube's clock
to January 1. Krusty, in his spiffy duds, will be selectable from the
Character Selection screen.
Unlock Santa Apu:
To see Apu dressed as Santa Claus, set your GameCube's date to
December 25. The jolly Kwik-E Mart owner will then be available on the
character select screen.