1) President of the First Congress of immunologists of Yugoslavia, Opatija, October, 21-25, 1985.

2) President of the Organizing Committee of the First meeting of immunologists and allergologists of Alps-Adria Working Community (Alps-Adria Immunology and Allergology Meeting 1990), Opatija, October 14-17, 1990.

3) President of the Organizing Committee of International meeting "Mechanisms in Local Immunity" (2nd Alps-Adria Immunology and Allergology Meeting) Opatija, Croatia, September 26-28, 1994)

4) Organizer of the "18th Tumour Biology Training Course" of International Union Against Cancer (UICC) together with Enrico Mihich (Buffalo, USA), P. Brentani (Sao Paolo, Brasil) and G. Sava (Trieste, Italy), Trieste-Rijeka, June 20-26, 1996.

5) President of the Organizing and Scientific Commitee of the Third International Meeting "Mechanisms in Local Immunity", Opatija, Croatia, September, 26-28 1996.

6) President of the Third Meeting of Alps Adria Society for Immunology of Reproduction, Opatija, Croatia, September 26-28, 1996

7) President of the Organizing and Scientific Committee of the Fourth International Meeting "Mechanisms in Local Immunity", Opatija, Croatia, September 16-19, 1998.

8) President of the Fourth Meeting of Alps Adria Society for Immunology of Reproduction, Opatija, Croatia, September 16-19, 1998.

9) President of the International Congress Commitee of the VIII International Congress of Reproductive Immunology, Opatija, Croatia, July 2-6, 2001. http://mamed.medri.hr/eng/kongresi/icri/

10) Organizer of the First EMBIC Summer School: Embryo implantation: from basics to clinics, Malinska, Croatia, June 4-10, 2005. http://www.medri.hr/embic/

11) President of the International Congress Committee of the X International Congress of Reproductive Immunology, Opatija, Croatia, June 10-14, 2007. http://mamed.medri.hr/isir/