The next most important activities of UEF were a lot of public demonstrations attracting thousands of participants. For example, the demonstration in conjunction with the European Council in Rome in December 1975, where it was decided that the European election would be held even without the participation of the United Kingdom and Denmark (although in the end, they did take part), a demonstration with 5,000 participants in Strasbourg on 17 July 1979 in front of the seat of the European Parliament, to coincide with its first session after its election in June the demonstration coinciding with the European Council in Fontainebleau on 25 June 1984 and the spectacular demonstration in Milan – its 100,000 participants make it the biggest popular demonstration in the history of the federalist struggle – in conjunction with the European Council of 28 and 29 June 1985, where the majority decided to call an Intergovernmental Conference to review to Community treaties.