Trick-or-treaters are invited to visit local businesses in Kennebunk, Kennebunkport and Arundel between 4 and 6 p.m. on Halloween, Tuesday, Oct. 31. There are no set hours for residential trick-or-treating. The Chamber of Commerce is organizing the efforts, and all local businesses are invited to participate. Interested shopkeepers should expect several hundred trick-or-treaters, depending on weather. Based on RSVPs, The Chamber will compile an ongoing list of participating businesses below and deliver orange balloons to them on Halloween.