According to Swiss website 20 Minuten Online, Jamiroquai will be performing a 45 minute showcase gig at the Kaufleuten in Zurich on Monday 9 November. Tickets cannot be purchased, only won.
It seems to be three ways to enter the competition (only available to Swiss residents)
+ by clicking "Participation Gratuite" -> http://www.20min.ch/ro/entertainment/co ... articiper/
+ by sending a SMS with the word THESHOWCASE with your name and address to the 2020
+ Enter online at Sunrise.ch