External Affairs Minister Sushma Swaraj arrived here on Saturday to preside over the International Yoga Day celebrations in the United Nations as well as across the city.Swaraj, who arrived early in the morning, was received by Indian Ambassador to the UN Asoke Mukerji at the airport.She will be joined by UN Secretary General Ban Ki-moon, President of the General Assembly Sam Kutesa, Congresswoman Tulsi Gabbard, spiritual leader Sri Sri Ravi Shankar and several other diplomats at the commemoration at the UN headquarters tomorrow.