There are a few ad-hoc references to The Grand Prix Running Association in various 1970s contemporary magazine reports. This seems to be an informal collective of drivers and team personnel who took it upon themselves to hold running races around racetracks on the day before official practice started. There are odd photos here and there - the race preceding the 1973 Italian GP being a case in point. For the most part they are either overlooked or ignored and I don't recall seeing commentary on who won any of them.
I'd be interested in learning more about these contests; can anyone shed any light, or has anyone any recollections, anecdotes or photos?