I would third or fourth volunteering to marshall or if a team is looking for someone to crew that's not a bad gig either. I've done both as well as spectated on my own a couple times.
Definitely be careful driving on the roads up there, if all goes as planned they will be pretty terrible.
I trailered someone else's rally car behind a Ford Exploder one year, at night, to Lewiston and don't think I've ever gripped a steering wheel that hard.
Can't stress warm clothing enough either. Standing in one spot spectating outside, and possibly standing in the snow, makes quick work of any warmth you might have.