1957 United Nations (Imperforate)
1961 Communications Ministers Conference (F/U)
1961 Communications Ministers Conference M/S
1963 European Sport M/S
1965 Sailing Championships (M/S)
1975 European Security Conference
1975 Architectural Heritage
1991 Admission to CEPT
1991 Anniv. Battle of Legnica
1991 KSZE/ Cultural Symposium
