During the 2008 Tibetan unrest, Tutu marched in a pro-Tibet demonstration in San Francisco; there, he called on heads of states to boycott the 2008 Summer Olympics opening ceremony in Beijing "for the sake of the beautiful people of Tibet". Tutu invited the Tibetan Buddhist leader, the 14th Dalai Lama, to attend his 80th birthday in October 2011, although the South African government did not grant him entry; observers suggested that they had not given permission so as not to offend China, a major trading partner.