When the guests visit you, they wander around your base, use your tables and sleep in your beds.
So, why not generate an ally base when your caravan arrive in an ally settle? So your settlers could talk and negotiate with the locals, expanding the idea of story generator for caravans as well.
Settlers will not be able to work at all.
Steal resources or Attack people will result in badwill.
You can participate in events that occur in the settle.
You can mark what you want to sell or buy, but it's the ally who chooses what he wants to trade. (the opposite of guests in your settle).
I hope you enjoy this suggestion and I wish to continue a good job! ;)
A socially relaxing point would be cool specially because caravan pawns love to go berserk about everything.