In December 2014, the couple visited the United States and attended a charity dinner at the Metropolitan Museum of Art. In October 2015, the Duchess attended her first state banquet at Buckingham Palace, held to host Chinese President Xi Jinping. In April 2016, the Duchess and her husband undertook a tour to India and Bhutan. Activities included visiting children's charities such as Childline India, as well as a visit to Lingkana Palace. Later that month, the couple met again with President Obama and First Lady Michelle Obama at Kensington Palace. The Duke and Duchess toured Canada again in September 2016. On 11 October 2016, the Duchess made her first solo foreign trip to The Netherlands. Countries visited by the couple in 2017 include France, Poland, Germany, and Belgium. The Duchess takes official portraits of her children and joined the Royal Photographic Society in 2017. She visited Luxembourg City in May 2017 for the Treaty of London commemorations. In January 2018, the couple visited Sweden and Norway. In February 2019, the Duke and Duchess carried out a two-day visit of Northern Ireland, visiting Belfast, Fermanagh, and Ballymena.