In May 2016, Knightley signed a letter imploring Britain to vote "remain" in the UK EU referendum. The letter was also signed by John le Carré, Benedict Cumberbatch and Danny Boyle among others. Later, she appeared in a video aimed at encouraging younger people to vote in the referendum. On 12 September 2016, Knightley, as well as Cate Blanchett, Chiwetel Ejiofor, Peter Capaldi, Douglas Booth, Neil Gaiman, Jesse Eisenberg, Juliet Stevenson, Kit Harington and Stanley Tucci, appeared in a video from the United Nations' refugee agency UNHCR to help raise awareness of the global refugee crisis. The video, titled "What They Took With Them", has the actors reading a poem, written by Jenifer Toksvig and inspired by primary accounts of refugees, and is part of UNHCR's #WithRefugees campaign, of which also includes a petition to governments to expand asylum to provide further shelter, integrating job opportunities, and education. In September 2016, Knightley co-hosted A Night to Remember, part of the Green Carpet Challenge, a charity event highlighting sustainability within the fashion industry.