Peace & Justice History for 9/23:

September 23, 1949
President Harry Truman announced that the Soviet Union had exploded its first atomic bomb, an implosive plutonium weapon, the previous month (it had happened on August 29). “We have evidence,” the White House statement said, “that within recent weeks an atomic explosion occurred in the U.S.S.R.”
September 23, 1979

200,000 attended an anti-nuclear rally in New York City’s Battery Park. It was the largest political protest of the late ’70s in the U.S., six months after the partial meltdown of the nuclear reactor at Three Mile Island, Pennsylvania. Two days earlier the ‘No Nukes’ concert, also known as the “Muse (Musicians United for Safe Energy) concert,” was held in Madison Square Garden, featuring Bruce Springsteen, Crosby Stills & Nash, Jackson Browne and others.
More about the concert, the record and the film 
September 23, 1982
Dr. Jane Goodall created Roots & Shoots Day of Peace in 1982 in honor of U.N. International Day of Peace; each year, Roots & Shoots Day of Peace is observed in late September. Roots & Shoots groups around the world fly Giant Peace Dove puppets to celebrate Roots & Shoots Day of Peace for its symbolic meaning. They also plan and implement peace project initiatives to help make the world a better place for animals, the environment and the human community.
Hear Jane Goodall on World Peace Day 
Dr. Goodall was appointed a Messenger of Peace in 2002 by U.N. Secretary-General Kofi Annan. People selected as Messengers of Peace are widely recognized for their achievements in music, literature, sports and the arts.To commemorate her appointment, Roots & Shoots members at the University of Wisconsin-Stevens Point first conceived of and created the Giant Peace Dove puppets. Since then, Roots & Shoots groups have flown doves in over 40 countries around the world.

https://www.peacebuttons.info/E-News/peacehistoryseptember.htm#september23