The term "marquee person" is not a widely recognized or standard phrase. It is possible that the term is being used in a specific context or industry with a specialized meaning. However, without more context, it is challenging to provide a precise definition.
In some cases, "marquee" can refer to a canopy-like structure often used as a sign or roof over the entrance of a theater, hotel, or entertainment venue, displaying the name of the establishment or current shows. It is typically illuminated and used for promotional purposes.
If you can provide more information or context about where you encountered the term "marquee person" or how it was used, I'd be happy to try and provide a more relevant explanation.