Just a couple examples, because I have the boredom only comes with being 28 years old and having a 4-week Christmas break.
Harvest Festival:
In the years after the cataclysm, obtaining regular sources of food became a primary concern. The Harvest Festivals that have become an annual tradition in [City] provide a degree of comfort to the population as to your ability to lead them, as well as providing a forum through which the farmers of the town may exchange ideas.
City recieves 20% fewer dissidents and tiles worked by the city provide +1 food.
Rarity: Rare.
Military Culture:
In the face of daily adversity, the peoples of [what the hell is the name of the game world, anyway?] cope in many ways... despair, addiction, and violence. However, in [City name] an ardent military vigor has taken hold of the population. Youth are trained from adolescence in the art of reconnaisance and to endure hardship that will serve them well during subsequent military service.
City gets +2 to Sight radius and all units trained recieve +20% hitpoints.
The growth rate and trade rate in the city are both reduced by 20%.
Requires: Barracks. Rarity: Very rare.