Yes, it's true. The Catalina Wine Mixer was a fictional event. Those familiar with the Will Ferrell movie Step Brothers will know the reference to the Catalina Wine Mixer. The characters in the film, Dale and Brennan, played by John C Reilly and Will Ferrell become step brothers in their 40's after their parents, played by Mary Steenburgen and Richard Jenkins marry. Crazy antics ensue including planning the "biggest helicopter leasing event in the Western Hemisphere," also known as the "F#$%% Catalina Wine Mixer."