Judy Garland who plays Dorothy from the Wizard of Oz is seen as a Uber gay icon, hence the reference is used to refer to gay social scene.
They are having a Friends of Dorothy Night as part of the itinerary in the piano lounge.
(Closeted) queer - from friends of Dorothy Parker who was known to have many close and flamboyant gay friends.
Like this "...Friend of Dorothy"
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Someone who bites the pillow; is known or suspected to have the ability of guessing the flavor of a popsicle by sitting on it.
Ryan Seacrest is a friend of Dorothy.
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Code for asking a guy if they are gay, used in old times.
Guy 1: Hey dude, are you a friend of Dorothy?
Guy 2: Hell yeah.
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The song "Goodbye Yellow Brick Road" is such an obvious reference to "Wizard of Oz" (1939 film) that clearly a friend of Dorothy's involved with this.