Every two years the world’s flag people come together to discuss the subject they love best, flags, hear talks on various vexillological subjects and socialise. These meetings are called the Internatiopnal Congresses of Vexillology (ICV). The first ICV was held in Muiderberg in 1965, and since 1969 have been sponsored by the world’s flag organization, FIAV (Fédération internationale des associations vexillologiques).

The Flag Institute has hosted two International Congresses of Vexillology: the 5th Congress in London and the 19th Congress in York. It also assisted the Heraldry Society with the 10th Congress in Oxford. Most of the Proceedings of the 5th Congress were published in the Flag Bulletin but two of the papers are available here as PDFs. All the Proceedings of the 19th Congress are available here as PDFs.

At the 23rd FIAV General Assembly in Rotterdam, 2013, the Flag Institute was awarded the hosting of the 27th Congress in Greenwich, London. The 2019 flag conference will be in Central London in the latter part of the 2019.