Not to compete with your ride (how can you compete with Switzerland Loop?), but happening on Sunday is the Weld County Waltz, the second to last ride in the Fort Collins Winter Ralleye series. Meet at 7:30 at the Bean Cycle in Fort Collins. Loop is about 80 miles.
Here's a map from last year, this year's ride is the same except it finishes at Road 34 Bike Bar.http://coloradogravelroads.com/weldwaltz.html
Looks like some good gravel roads, if I wasn't recovering from being hit by a car, I would totally ride both days, but I'll have to pass on the Sunday ride. Do you guys have a spring/summer/fall series as well, I'm trying to find more people who like riding gravel?.