The Wild Beyond the Witchlight: Dungeons & Dragons (DDN)
The Wild Beyond the Witchlight: Dungeons & Dragons - Rules of Play says:
Once every eight years, the fantastic Witchlight Carnival touches down on your world, bringing joy to one settlement after the next. Its owners, Mister Witch and Mister Light, know how to put on a good show. But there’s more to this magical extravaganza than meets the eye! The Wild Beyond the Witchlight takes adventurers from the Witchlight Carnival to Prismeer, a Feywild domain of delight, and is designed for characters of levels 1–8. This book comes with a poster map that shows the carnival on one side and Prismeer on the other.