If you're a public librarian, you've probably used Chase's Calendar of Events. It's one of the few print reference resources we still hang on to in my branch, and we use it a lot for display inspiration. It's also good for a laugh, since it will tell you that January is Teen Driving Awareness Month (be very aware of those teens and you'll stand a better chance of survival) and that July is Horseradish Month. Important stuff.
With that in mind, I thought it would be fun to highlight a few (mostly YA) books that would be good for some of those more obscure October holidays.