The executive summary: Snowshoe race @10AM, bike race @1PM. At Lowes Creek County Park, same place as the July WORS race. Two categories based on tire size (over/under 3"). Two mile laps, 1 hour length. Snowshoe=$25, Bike=$15. This is a fundraiser for the local trails organization.
There is a group that rides the trails year 'round, I am not one of them. I don't know the details of the race. I've heard about groomer development, and that it may involve one of these: http://www.rokon.com/products/scout.htm
They've used it in a city park, don't know if the county has signed off on it.
Current snow levels are light. On the ski trails before this last snowfall it was not deep enough for your good skis. Based on what I was seeing when the ground was bare I'd assume a thin layer of ice under much of the singletrack.