The meeting will focus on cooperation in the region and EU enlargement after Croatia's accession.
According to an announcement from the government, the celebration will be attended by presidents Tomislav Nikolic of Serbia, Borut Pahor of Slovenia, Gjorge Ivanov of Macedonia, Atifete Jahjaga of Kosovo, Filip Vujanovic of Montenegro, Bujar Nishani of Albania, and the three members of the Bosnian Presidency.