Museum celebrates 60 years of Ono art The Schirn Kunsthalle museum in Frankfurt, Germany, launches a Yoko Ono retrospective to mark the artist's 80th birthday. The exhibition features characteristic works, using a variety of media, from the past 60 years. Ono became well known in the early 1960s in New York and then in Japan. The exhibition takes a close look at her works from the sixties and seventies, including her influence on concept and performance art, film, music and her work for peace. G20 tackles growing risk of currency war Finance ministers and central bankers of the Group of 20, the world's most powerful advanced and emerging economies, meet in Moscow for two days of discussions, which economists expect to focus on the growing risk of a currency war. Both Japan and the United States have been criticised for policies seen as intended to stimulate their economies further - and weaken their currencies in the process. Catwalks sizzle for London Fashion Week Buyers, fashion editors and celebrities descend on London as designers show their latest womenswear ranges at the start of the five-day London Fashion Week. Leading British designers such as Vivienne Westwood, Christopher Kane, Alice Temperley and Christopher Bailey will show their latest creations alongside emerging young talent. Singer Rihanna will launch her first collaboration with high-street retailer River Island. Top photographers snap up awards In The Hague a judging panel of leading professionals in the field of photojournalism announces the winners of the prestigious 56th World Press Photo Awards. The annual competition is the leading photojournalism contest in the world and is open to all professional press photographers, photojournalists and their representatives. Cleric to lead rallies in Pakistani cities Cleric Tahirul Qadri starts a series of rallies in six Pakistani cities. Gujranwala is first, followed by Faisalabad, Multan, Peshawar, Sukkar and Rawalpindi. The Canadian-Pakistani, whose calls for transforming Pakistan into a moderate Islamic state have made him an instant political star, was grilled by the Pakistani supreme court this week on how he could be loyal to Pakistan while holding a Canadian passport. Qadri was in court to file a petition calling for the dissolution of the country's electoral commission, which he alleges is not equipped to ensure fair and transparent elections. Expo leads visitors up the aisles The 70th Valentine Wedding Service and Banquet Expo opens at the convention and exhibition centre in Wan Chai. The three-day, quarterly event claims to be the longest-established wedding expo in the city and offers a range of wedding products and services as well as catwalk shows and celebrities participating in special activities.