I grew up on the northwest side of Detroit in the 50s and 60s. At that time, Devil's Night was October 30th, and we kids understood it as the night to go out and do the mischief that "trick or treat" supposedly threatened. In other words, you could ring doorbells, egg houses, soap car windows (or, if you were mean, wax them with candle wax -- much harder to clean off), and play other pranks on the 30th, then go out the next night to get your loot.

Since in my mainly blue-collar neighborhood putting wax on windows was seen as extreme, you can figure that the burning of houses, chronicled by Zev Chafets in Devil's Night and Other True Tales of Detroit, was unknown at that time. I believe this sort of criminality tracked with the overall collapse of Detroit, which once had the largest proportion of single-family homes of any major U.S. city. You can conveniently fix the beginning of the fall with the riot of 1967.   

I don't remember many kids yelling "trick or treat," by the way. In my neighborhood, the cry was "help the poor!" (Sometimes expanded to "Help the poor / my pants are torn / gimme some money / and I'll buy some more."