The QBs started right after WWI when pilots missed the camaraderie of the war and started meeting once a month for dinner in New York City. A newspaper reporter described the wild dinner participants (strippers, booze, etc.) as "Quiet Birdmen." So, they took that name.
Charles Lindbergh was a QB. Ernest Gann was a QB. I am a QB.
Two requirements: You must have at least 500 hours of pilot in command time, and you must be a good fellow. There are no dues, no officers (though there is a Key Man who runs the meetings). The tales of strippers and drunks are not today's QB meetings. I have attended hangar events in Kalamazoo, Toledo, Minneapolis and here in Wausau, WI. We have dinner, sometimes a guest presentation or a video, occasional jokes, and good fellowship.