Multiple hordes arrive from neighboring towns, either adding infestations or adding more hordes in the area,
Raiders arrive and start setting up in town, adding a hostile faction in the area
Survivors have migrated to your area in search of supplies, adding a neutral faction
Faction specific events:
Sheriff: Local forces clear out an infestation as thanks for the sheriff (instead of supplies clear out an infestation)
Fighting breaks out between bandits and the sheriff's, no supplies arrive this day.
Trader: A local trader arrives hearing off your deeds
Raiding: the Boon trader is under attack from raiders, (if you don't arrive on time there is a chance the boon trader is killed if he survivors relations go cold.
Warlord: Survivors traveling in the area pay a toll, survivors get random supplies
News of the warlord's actions travel far, the relationship between you and two factions goes down by 1
These events could make games much more unique than the ones already added. It makes games my dynamic and unpredictable