It only happens once every three years. Aussie genies call it Congress but it has nothing to do with politics. It’s full title is The Australasian Congress on Genealogy and Heraldry (quite a mouthful).
Congress is held every three years under the auspices of AFFHO, the Australasian Federation of Family History Organisations and brings together passionate family historians from around Australia, New Zealand and many parts of the world.
Read about Congress history here: http://www.affho.org/affho/congresses.php.
Related Term: Congressitis