Colorado Land Cruisers is doing a run to Mt. Blanca tomorrow (Saturday). They plan on leaving the trailhead at 9:30AM. The directions to get there are:
From Denver, take I-25 south to Walsenburg, then take Highway 160 west. Before you get to Alamosa you will turn north on Highway 150 following signs to the Great Sand Dunes. Road 975 is on the right, about 3.2 miles down Highway 150. Drive a little way down this road to find a large area to air down and leave trailers if necessary.
You can also meet up with some of the group at the McDonald's on Hwy 50 just West of I-25 in Pueblo between 6:00 and 6:15AM to convoy down.