I sing on Halloween:

Tam Lin (#39) - no ghost but ghastly things and does mention Halloween.

Faithful Johnny – no ghost but does mention Halloween.

She Moved Through the Fair – whether she's actually dead is controversial but if Margaret Barry thought so then I prefer to think she is.

Unfortunate Miƒs Bailey – yep, great. I don't know if K3 sing the last, handwritten verse, "Next morn his man knocked at his door..." but it's certainly includable.