Hi Deltron,
I don't think that the majority of the schools have regional interviews. The only school that I have encountered publically announcing that they have regional interviews is Boston University. The other school that "may" have regional interviews might be Marquette and/or Creighton only because I know these schools to go to schools to promote themselves and their program and they might do some rare interviews there. However, majority of the other schools I know do not have regional interviews. I hope this helps.
Regards,
DesiDentist