Question: When was the anti-nuclear activist that Left Unity hosted born?
Context: Daisaku Ikeda (池田 大作 , Ikeda Daisaku , born 2 January 1928, Japan) is a Buddhist philosopher, educator, author, and anti-nuclear activist.  He has served as the third president and then honorary president of the Soka Gakkai, the largest of Japan's new religious movements. Ikeda is the founding president of the Soka Gakkai International (SGI), the world's largest Buddhist lay organization with approximately 12 million practitioners in 192 countries and regions. Koeberg Alert is an anti-nuclear activist organisation formed in 1983 as a local campaign against South Africa's nuclear programme, in particular the construction of Koeberg Nuclear Power Station.  It is possibly the country's first activist green movement, apart from Nan Rice's Dolphin Action and Protection Group.  For years it was allied to the broader democratic and anti-apartheid movement.  It currently organises various anti-nuclear campaigns, as well as participates in the wider anti-war and peace movements. Ole Andreas Kopreitan (19 September 1937 – 23 January 2011) was a Norwegian political activist, best known as an anti-nuclear activist.  For 30 years he led the anti-nuclear organization "No to Nuclear Weapons". André Larivière (born 1948) is an ecologist and anti-nuclear activist from Quebec, Canada.  He has lived in Europe since 1986 and was a leading speaker for the French Sortir du nucléaire network.  In February 2010, he has been elected member of the board of trustees. Helen Mary Caldicott (born 7 August 1938) is an Australian physician, author, and anti-nuclear advocate who has founded several associations dedicated to opposing the use of nuclear power, depleted uranium munitions, nuclear weapons, nuclear weapons proliferation, and military action in general. Ardeth Platte, O.P., (born 1936) is an American Dominican Religious Sister and anti-nuclear activist.  She was inducted into the Michigan Women's Hall of Fame in 1999. Carol Gilbert, O.P., (born 1947) is an American Dominican Religious Sister and anti-nuclear activist. Macy Morse (born January 25, 1921) is an American non-violent peace activist, and anti-nuclear activist. Megan Gillespie Rice, S.H.C.J., (born January 31, 1930) is an anti-nuclear activist and Roman Catholic religious sister of the Society of the Holy Child Jesus and former missionary.  She is notable for breaking into the Y-12 National Security Complex in Oak Ridge, Tennessee, at the age of 82, with two fellow activists of the Transform Now Plowshares group.  The break in was an antiwar protest referred to as "the biggest security breach in the history of the nation's atomic complex." Left Unity is a not-for-profit incorporated association established in South Australia for the purpose of uniting the state's political left and supporting progressive social and environmental activism.  It was formed in 2010 and was later incorporated.  By mid-2012, Left Unity had coordinated community pickets against the South Australian Defence Industry Exhibition (DIE), engaged in solidarity actions during a Lilydale industrial dispute, marched at May Day rallies and organised public forums on various topics.  Topics represented at public forums have included: carbon tax, occupational health and safety, education and neoliberalism and worker cooperatives. Left Unity hosted Afghan dissident and feminist Malalai Joya in 2011 and anti-nuclear activist Helen Caldicott in 2012.
Answer: 7 August 1938