2009 Red Hills Rumble

I don't know any more about this race than what I've read on MTBR and their website, but it sounds interesting:

The Trogs are hosting an MTB TT and Food Drive on December 20th at Red Hills Rec Area (ed: South of Sonora). It'll be cold, maybe wet, definitely brutal. Red Hills is a favorite winter riding and this winter we're going to combine a fun day on the bikes with a food drive.

Check out the website for details: http://www.trogspace.com/redhills.