The same creators also did:
Batman: Madness A Legends of the Dark Knight Halloween Special (DC, 1994 series) and
Batman: Ghosts Legends of the Dark Knight Halloween Special (DC, 1995 series).
They would also do Batman: The Long Halloween (DC, 1996 series).
In the costumed party one can see Bill Watterson's Hobbes, Alice in Wonderland, L. Frank Baum's Tin Man, Jeff Smith's Phoney Bone, Dave Sim's Cerebus, Evan Dorkin's Milk & Cheese, and David Boswell's Reid Fleming.