Brewer's: Mark's Eve
(St.). On St. Mark's Eve all persons fated to be married or to die pass, in procession, the church porch.
`Tis now,' replied the village belle, `St. Mark's mysterious eve. ... The ghosts of all whom Death shall doom Within the coming year In pale procession walk the gloom. ...
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894