Spain's Guggenheim Museum Bilbao. In 2014 she contributed several artworks to the triennial Folkestone art festival. In 2015 the Museum of Modern Art in New York City held a retrospective exhibition of her early work, "Yoko Ono: One Woman Show, 1960– 1971". In 2022 the Kunsthaus Zürich opened a retrospective, Yoko Ono. This Room Moves at the Same Speed as the Clouds. Political activism, social media and public appreciation Ono has been an activist for peace and human rights since the 1960s. After she and Lennon married in Gibraltar, they held a March 1969 "Bed-In for Peace" in their honeymoon suite at the Amsterdam Hilton Hotel. The newlyweds were eager to talk about and promote world peace; they wore pajamas and invited visitors and members of the press. Two months later, Ono and Lennon held another Bed-In at the Queen Elizabeth Fairmont in Montreal, where they recorded their first single, "Give Peace A Chance". The song became a top-20 hit for the newly christened Plastic Ono Band. Other performance/demonstrations with John included "bagism", iterations with John of the Bag Pieces she introduced in the early 1960s, which encouraged a disregard for physical appearance in judging others. In December 1969, the two continued to spread their message of peace with billboards in 12 major world cities reading "WAR IS OVER! If You Want It – Happy Christmas from John & Yoko". In the 1970s, Ono and Lennon became close to many radical, counterculture leaders, including Bobby Seale, Abbie Hoffman, Jerry Rubin, Michael X, John Sinclair (for whose rally in Michigan they flew to sing Lennon's song "Free John Sinclair" that effectively released the poet from prison), Angela Davis, and street musician David Peel. Friend and Sexual Politics author Kate Millett has said Ono inspired her activism. Ono and Lennon appeared on The Mike Douglas Show, taking over hosting duties for a week. Ono spoke at length about the evils of racism and sexism. She remained outspoken in her support of feminism, and openly bitter about the racism she had experienced from rock fans, especially in the UK. Her reception within the US media was not much better. For example, an Esquire article of the period was titled "John Rennon's Excrusive Gloupie" and featured an unflattering David Levine cartoon. After the Columbine High School massacre in 1999, Ono paid for billboards to be put up in New York City and Los Angeles