The PCs are stuck in a town with a strict peace policy, the tiniest scuffle can land you years in prison. The town also happens to be a tourist haven, so inn-prices have skyrocketed. The only way the PCs can rest is if they splurge on a room, with their enemy.
City, group, religion; every time a significant event happens to the city/person a new name will be given to signify the event. Could add the names to previous ones like a list of titles or could just be completely changed every time.