The group is called MEDICHI, which is an acronym for "Methodic and Didactiv Challenges of the History of Informatics". Laszlo Boeszoermenyi has organized a workshop in Klagenfurt/Austria under this name.
Another source of people is coming form CHI 2008, ie. a SIG on user interface history conducted by Brad Myers and Anker Helms Jørgensen. CHI 2008 was held in Florence. To that extend the label MEDICHI still fits.
Feel free to join and let's see what emerges.