Grenfieth Sierra Cadena was speaker in the international conference on: “The administration of constitutional law”, organized by the Pontifical Catholic University of Paraná, on March 19, 2018 in Curitiba, Brazil.

Grenfieth Sierra Cadena was speaker in the international conference on: "The challenge of Public Law and equality in the New Legal Geography", held by the Goethe University in Germany and the Universidad del Rosario, on June 13, 2018 in Frankfurt, Germany.

Grenfieth Sierra Cadena was speaker in the International Seminar: "France / Colombia a dialogue between legal systems", held by the Council of State of France and the University of Rosario on September 11, 2017 in Paris.

Ramilka Taveras-Urzhumova was the coordinator and speaker of the 2nd Dominican-French Colloquium on international arbitration , on “The Extension of the Arbitration Agreement Within a group of companies and a state entity to the State” , held on August 26 and 27, 2015, in Santo Domingo, Dominican Republic.

Grenfieth Sierra Cadena was speaker in the Inaugural Chair at Universidad del Rosario on: "State contracts in the European Union: a Franco-German look", on February 8, 2018, in BOGOTA.

Grenfieth Sierra Cadena was speaker the Cybersecurity Forum on: "The challenges and opportunities", organized by the Universidad del Rosario, on November 14, 2018, in BOGOTA.

Grenfieth Sierra Cadena was speaker in the International seminar on: "The current state of administrative law in the European Union and in Latin America from comparative law", organized by the Universidad del Rosario on February 10, 2017 in BOGOTA.

Ramilka Taveras-Urzhumova was coordinator and speaker of the 1st Dominican-French Colloquium on International Arbitration , on "The Efficacy of International Arbitration Awards in Dominican and French Law", held on October 29, 2014 in Santo Domingo, Dominican Republic.

Grenfieth Sierra Cadena was speaker in the international conference on: “The internationalization of administrative law”, held by the Panthéon-Assas University, on June 24, 2018 in Paris.

Grenfieth Sierra Cadena was speaker in the international conference on "Regulation in Comparative Administrative Law in the United States and the European Union", organized by the Universidad del Rosario, on September 7, 2018 in BOGOTA.

Grenfieth de J. Sierra Cadena was speaker in the International Colloquium on: "Smart cities under the challenges of law and comparative administration", organized by the Universidad del Rosario on November 23, 2015 in BOGOTA.

Grenfieth de J. Sierra Cadena was speaker in the “Ibero-American Colloquium” , organized by the Max-Planck-Institute für ausländisches öffentliches Recht und Völkerrecht, on May 15, 2013, in Heidelberg, Germany.