<img src="https://www.schwimmerlegal.com/images/lasvegas.jpg" <
Two different issue in this NY Lawyer article: (1) Rightsholders in WHAT HAPPENS HERE, STAYS HERE is suing the owner of registrations for WHAT HAPPENS IN VEGAS, STAYS IN VEGAS; (2) The advertising agency that created the WHAT HAPPENS HERE slogan is the owner of the slogan and not the client, the Las Vegas Convention and Visitors Authority.
Background on $1 transfer of slogan to agency here.
Suggestion that the slogan sends the wrong message here.