Overhaul and expanding of marriage and tournament system.
Some details:
Tourneys should have different tiers and the player, depending on his clan rank and available influence, should be able to organize his own tourney.
Example of tourney tiers:
• village brawl (fight against village people),
• bar fight (fight against townsfolk),
• militia competition (fight against recruits)
• town tournament (fight against garrison units, 2 days long)
• royal tourney (fight against noble knights, 3 days long)
Each tournament also has a chance to trigger certain events, like raising or losing relation with someone, chance for a romance or friendship (new status), random mission offer, vassalage offer when independent, interaction with criminals during the night, engaging in romance or impress the opposite gender, asking for the hand of a daughter/son, going on a party at night or after the tourney...
There should be tournament exclusive items. Like very fancy armour. Maybe a complete Armorset, when you win royal tourneys at every faction.
or
Building your own castle or camp, anywhere on the map if certain conditions are met.