The observance of the International Day for the Eradication of Poverty can be traced back to 17 October 1987. On that day, over a hundred thousand people gathered at the Trocadéro in Paris, where the Universal Declaration of Human Rights was signed in 1948, to honour the victims of extreme poverty, violence and hunger. They proclaimed that poverty is a violation of human rights and affirmed the need to come together to ensure that these rights are respected. Since then, people of all backgrounds, beliefs and social origins have gathered every year on October 17th to renew their commitment and show their solidarity with the poor.
Through resolution 47/196 adopted on 22 December 1992, the UN General Assembly declared 17 October as the International Day for the Eradication of Poverty.
Sourced from https://www.unesco.org/en/days/poverty-eradication