So here's the list. Let me know if I've forgotten any titles. You may also want to check out my Veterans Day Mystery List.
Memorial Day Mysteries
Memorial Day by Vince Flynn
The Decoration Memorial Day War by David H. Brown
Absolute Certainty by Rose Connors
Memorial Day by Harry Shannon
Shadows at the Fair by Lea Wait
The Memorial Day Mystery short stories on the web.
For the young set: The Mystery of the Memorial Day Fire by Kathryn Kenny, a Trixie Belden mystery.
Have a good holiday. Be safe and Remember.