Hi Hestia,

I think it's maybe the Zürich Silvesterlauf you're looking for?

http://www.silvesterlauf.ch/

I did it last year with a couple of other EFers, was lots of fun - loads of support cheering us on, albeit very crowded actually in the race itself. Different distances ranging up to 8.6km, and also different time categories too.

cheers
jot