Tons of great detailed advice so far about what to bring thsts useful without bringing the proverbial kitchen sink.
just want to highlight a comment that was made to ensure it wasn't missed- take a basic repair class or two.
in NWAR, there has to be a co-op or collective that holds basic repair classes.
I was going to suggest REI, but am shocked there isnt one in your state, given the overall population, wealth, and infrastructure in NWAR over the last 20 years.
bike shops often hold these classes too- its more than just a rundown by a shop, it's you working on your bikes as a group so it takes a lot longer and allows for more questions.
bikes arent complicated...well at least typical touring bikes arent complicated. Its a bunch of cables and screwed in parts- that's really all the adjustable parts are. You just need to know how much to adjust em.