The city of Worcester recommends trick-or-treating between 5 p.m. and 8 p.m. The city's police department also shared some common-sense safety tips for candy collectors, like wearing brightly colored costumes that are more visible to drivers and having parents inspect all candy before eating it.

An ancient Celtic Festival, the Catholic Church, the Irish Potato Famine, and community leaders turned Halloween into the holiday we know today. Here's the history.