WORLD AGENDA April 2016 April 21, Riyadh: U.S. President Barack Obama visits Saudi Arabia for a summit with Gulf Arab leaders in a bid to repair relations strained by last year’s nuclear deal with Iran. He also travels to the UK and Germany Apr 20, Hawaii: Solar Impulse, the plane built to fly day and night on zero fuel, leaves Kalaeloa in Hawaii to resume its record- breaking circumnavigation of the globe powered only by the Sun April 13, Damascus: Parliamentary elections are due to take place in Syria. President Bashar al-Assad decreed they would take place shortly after Washington and Moscow announced a ceasefire plan in February Apr 10, Peru: Keiko Fujimori, who narrowly lost her first presidential bid in 2011, is the frontrunner to win this time around. She is the daughter of ex-president Alberto Fujimori, jailed for 25 years for human rights abuses and corruption Apr 21, Greece: The Olympic torch will be lit in the ancient city of Olympia ahead of the 2016 Summer Games in Rio Apr 21, London: Queen Elizabeth II turns 90. Celebrations take place in June on her official ­– as opposed to her actual – birthday Apr 15, Sydney: Japan’s most advanced attack submarine, the Soryu, conducts joint military exercises with Australia over 11 days. Japan is competing against France to win a A$50bn contract to build Australia’s next submarine fleet Apr 6, New York: The oak chair that JK Rowling sat in to write the first two Harry Potter books is expected to fetch up to $45,000 at auction. The 1930s dining chair is listed as among the top five “finest collectibles in Muggledom” Source: Kate Edgley Pictures: AP, Getty Images, Heritage Auctions, Seaforces, Royal Mint