- the evening before Twelfth Day
- Twelfth Day or, specif., the evening of Twelfth Day
January 5, the eve of Epiphany, celebrated as a holiday in parts of Europe and the United States and marked by feasting, merrymaking, and the lighting of bonfires.
(plural Twelfth Nights)
- A Christian festival marking the coming of Epiphany and concluding the Twelve Days of Christmas, traditionally falling on the evening of January 5 (i.e., on the eve of Twelfth Day, January 6), but also sometimes defined as falling on the evening of January 6 (i.e., on the evening of Twelfth Day itself).