Info below cut and pasted from Dublin's own site.

Trick or Treat

Thursday, October 29, 2009 from 6 p.m. - 8 p.m.

Because Halloween falls on a Saturday this year, Dublin is following the recommendation of the Mid-Ohio Regional Planning Commission to hold Beggar’s Night on Thursday if the actual holiday is on a Friday, Saturday or Sunday.

The change is based on safety concerns as well as potential conflicts with high school and Ohio State University football games.