Encyclopedia does this and more!
The encyclopedia is a menu where you press a button, a meta information resource for the player that makes him an know it all omnipotent being, and I think this kind of system really, really sucks. I don't know about you guys, but if I wanted to play a game just to read text and clicking, I would go to Wikipedia, when I want to play an RPG, I want to play an RPG and get immersed into the world. Being an omnipotent being that knows everything by just going through menus makes this game absolutely boring, and it's an easy way out of actually thinking on game design.
Feasts were a multiple of things: A place to know lords, their attitudes (depending on the quests they give you, again, another rudimentary system that needed improvement but got changed for a menu encyclopedia information), an in game event that showed some sort of life, and a place to earn relations with lords and ladies (useless in Bannerlord because influence is s currency you win by killing poor people in rags AKA looters).