Well, tomorrow actually. So doing all the 'getting ready' stuff today. But had to change a tube:
The tire was a bit flat, so I put the pump on it and added air. Seemed like it was leaking about the valve, but then stopped. So I rode about for a couple of days. Then a few days later, it was flat again. Thinking a puncture, I pulled it out, and was surprised when the valve come away in my hand.
Looking closely at the valve, it looks like it never bonded well. I can push the valve stem into the hole and it does a good job of sealing it - but must slowly leak. Wondering if I can clean the metal up and use some glue and reclaim the tube.