Alas, this annual event appears to be a bit rocky organizationally, but official word just appeared that it is intended to happen again in 2010. On August -- er -- Argust -- 10th, get one or two of your old Argi out and shoot some pictures. Pick two to submit to appear on the Argus Day Flickr gallery.
The thread at Argus Group on Flickr explains most of what little there is to explain.
These senior citizens of the camera world (and maybe even the photographers behind them! ) need an occasional run to limber up the mechanics anyway.
DaveT, owner of a 1958 vintage C3, bought new as his first 35mm camera