Jazzafrazz Town is a mentioned-only location in Paper Mario: The Thousand-Year Door.
It's one of the places Luigi visited on his quest for Princess Eclair during the events of Paper Mario:The Thousand Year Door. Luigi describes this place as hip and full of Dayzees. This is where Luigi met Hayzee, his fourth partner, a Crayzee Dayzee with green petals. Jazzafrazz town's major event, it seems, is the Drama Slam competition held annually, the prize being a Marvelous Compass piece.