The instinct before a trip is to add. A slower weekend asks the opposite: pack for the version of yourself who has nothing to prove and nowhere to rush.
The Short List
One good book you have already started. One comfortable layer for early mornings. One notebook, mostly to be left blank.
What to Leave Behind
The second pair of shoes you will not wear. The itinerary you will not follow. The idea that a weekend has to be productive to have been worth it.