Well, I was going with Dan Shea!
Unfortunately, we set up our trip through CoM and it was cancelled due to low enrollment. Go figure.
Perhaps in a few months we'll just go on our own, as a group with more people. I was insterested in going with a guide or group the first time, just to get a good idea of the layout of the park. We can probably just pick up the info we need at the Lassen website, anyway.