Get ready for spooky season! This year, Trick or Treat in Hilliard will be held Thursday, Oct. 29. The City of Hilliard follows the recommendations of the Mid-Ohio Regional Planning Commission (MORPC) when picking a Trick or Treat date. When Halloween, Oct. 31, falls on a Friday, Saturday, or Sunday, Trick or Treat is held the Thursday prior to Oct. 31. When Oct. 31 falls on a Monday, Tuesday, Wednesday, or Thursday, Trick or Treat is held on Oct. 31.