There's a new years day ride up Mt. Wilson every year- there should be posts about starting time/location closer to new years. I've never done it, but it seems to be a bunch of loosely organized groups that ride a few different routes and a random number of people make it all the way up wilson, depending on the weather.

Last year I went out with a few friends and we rode up GMR to Baldy Village, and then turned around at Icehouse Rd. when the wind got to be too much.