I had to cheat a little bit, I’m not sure about other church archives but Halloween themed records and photographs are rather sparse here at the Maritime Conference Archives! Technically, the people in the photograph below are not celebrating Halloween but they are in costume so hopefully that counts.
In fact, everyone is dressed up for an “old fashioned Sunday School picnic” at a Canadian Girls in Training (CGIT) event, probably sometime around 1950. I can’t say for sure but I bet there was also some candy involved!