This is an event type/venue description, not a real performer. Search results show multiple venues (Riviera Theatre, Hanover Theatre, Grand Rapids Public Museum, etc.) that feature Wurlitzer organs and host organ concerts. 'The Mighty WurliTzer' refers to the NAME OF THE ORGAN at these venues, not a performing artist or group. 'Free Mighty WurliTzer Organ Concert' is a generic event title describing the type of performance, similar to how 'Grand Piano Concert' would not be a performer name. No evidence of an actual touring musician, band, or performance group with this name.