Taylor Swift may have played her second Eras Tour concert at Wembley Stadum on Saturday night, but she wasn’t the only game in town. British stars, from Keeley Hawes (Netflix’s Prince Andrew film Scoop), Yasmin Finney (Doctor Who), legendary broadcasters and newsreaders Moira Stuart and Angela Rippon, and Adrian Lester (Renegade Nell, The Sandman) to Indira Varma (Game of Thrones), Nathaniel Curtis (It’s a Sin), Taj Atwal (Line of Duty, Memory) and Susan Wokoma (Enola Holmes), flocked to London’s National History Museum to an animal masquerade ball organized by charity The Feathers Association, celebrating its 90th anniversary, and partners. And they were joined by such U.S. guests as Esai Morales (Mission: Impossible – Dead Reckoning Part One, Ozark).

The Feathers Animal Masquerade Grand Ball fundraiser for “people and planet” featured a white tie dress code and was one of the most expensive fundraising events ever to be held in London,...