When does gracie come on animal crossing wild world

on the week days there are several things that can happen. these are
gracie
UFO
pete
pascal
people in the coffee shop
dr shrunk

i cant remember if there are any more off the top of my head. talk to Booker at the town gate (he's the one fat stupid one on the left) if gracie comes, he'll tell you, but it will be fairly obvious anyway because she's parked right outside the town hall...
for some of the above, Booker won't know that they are there