Until now Prof. Cespedes has been organizer of three relevant conferences:
2001 «24th International Symposium on Natural Products Chemistry and its Applications: Perspectives and new trends», with Instituto de Quimica-UNAM, Mexico D. F., Mexico. November 1-9, 2001. Where attended many of his friends given so many interesting lectures.
2007 «VI International Symposium on Natural Products Chemistry and its Applications», with Department of Basic Sciences, Faculty of Sciences, Universidad del Bio Bio, Chillan, Chile. November 2007. Where attended many of his colleagues and friends from over the world.
2012: «VII International Symposium on Natural Products Chemistry and its applications», with Department of Basic Sciences, Faculty of Sciences, Universidad del Bio Bio, Chillan, Chile and Instituto de Quimica de Recursos Naturales, Universidad de Talca. Universidad de Talca, Talca, Chile. November 2012. Where attended many of his colleagues and friends from over the world.
2016: «IXth International Symposium on Natural Products Chemistry and its applications», with Department of Basic Sciences, Faculty of Sciences, Universidad del Bio Bio, Chillan, Chile, Technical University Santa Maria, Viña del Mar Chile, and Instituto de Quimica de Recursos Naturales, Universidad de Talca. Universidad de Talca, Talca, Chile. November 2016. Venue: Grand Hotel Termas de Chillan, Chillan, Chile. Where attended many of his colleagues and friends from over the world.
2019: «Xth International Symposium on Natural Products Chemistry and its applications», with Department of Basic Sciences, Faculty of Sciences, Universidad del Bio Bio, Chillan, Chile, Technical University Santa Maria, Viña del Mar Chile, and Instituto de Quimica de Recursos Naturales, Universidad de Talca. Universidad de Talca, Talca, Chile. November 2019. Venue: Grand Hotel Termas de Chillan, Chillan, Chile. Where will attend many of his colleagues and friends from over the world.