(There's a great video with a preview of the ride on the website.)
If you are not planning to do the Vineman preview, here's another option (ride only) for Saturday, 6/21. The website boasts: "Riding along creeks and rivers, past scenic mountain lakes with spectacular views of Mt.Shasta, Trinity Alps & Trinity Lake, Castle Crags and the Sacramento River to name just a few". I would like to do the metric century (62.4 miles/6500 ft climbing), but they also have a full century as well as metric half. I am planning to head up Friday, 6/20 and return after the ride on Saturday. Would love to get a small group together to carpool up and ride! One last detail: online registration may be closed, but according to the website, in-person registration can be done up until race day.