The theme for the Allison Sarofim's Halloween party was Gauguin's tropical Tahiti. All the guests, with the exception of Woody Allen and designer Valentino, showed up in tropical motifs. Here is coverage in the NEW YORK POST.
Had Allen conformed, he wouldn't have become an item in the media. This tactic enhances his personal branding at a time when his son Ronan Farrow is sure getting a lot of attention.