Unfortunately, the modern world concentrates more on the Halloween part of this rather than the Eve of All Hallows.
There is a wonderful service for the Vigil of All Hallow’s in the Episcopal Book of Occasional Services.
It is intended for use in the context of Vespers; after the customary opening verses and prayers a sequence of Scripture, Psalm, Silence, and Prayer is followed:
The Witch of Endor
LESSON 1 Samuel 28:3-19
The Vision of Eliphaz the Tishbite
LESSON Job 4:12-21
The Valley of Dry Bones
LESSON Ezekiel 37:1-14
The War in Heaven
LESSON Revelation 12:7-12
The service then concludes with the Te Deum and Intercessions.