Wende and Harry Devlin "Old Witch Rescues Halloween" (Reader's Digest Services, 090, 1974)
The last installment in the "Old Witch" trilogy from Wende and Harry Devlin, "Old Witch Rescues Halloween" followed 1963's "Old Black Witch" (sometimes remembered as "Blueberry Pancake Witch" and adapted for television in 1969 by Gerald Herman as "Winter of the Witch"), and 1970's "Old Witch and the Polka-Dot Ribbon". While it's a lightweight children's story really (and at about 9:10 or so you'll find a skip that I missed when I was doing my audio reconstruction of side two (there were a LOT of skips), perhaps if you pretend that it's an incantation of sorts you'll be able to get past it more easily), I've run into a number of people over the years with fond memories of the series. To give you some visuals, here are a couple of representative images...
...and here's the story in all its glory: