Short DnD campaign ideas?

I do my campaigns Fable style, as in my players literally get to have a hometown that they return to after each mission and get to eventually form relationships with the town locals and even get married and have families. I need ideas for campaigns that would take anywhere from a day to a month to accomplish (in game time) the main plot is the king of Valor is being mind controlled and the prince is vacated out of the castle (by a sorcerer too weak to go against a necromancer, a summoner and a juggernaut. The 3 of them are actually the main bad guys, amongst many demonic and draconic minions that were banished from this plan 50 years ago) and left in the care of the pcs "employer". That plot isn't going to happen til midway thru the campaign. I have 5 other towns that are in depth, a town that honors animals, a "contact" of the employers that smuggle goods, a town that deals with making potions, one that is technologically advance (they are high sorcerers that create refrigerates, alarm clocks and other things to add a little goofiness to it all, such as how Final Fantasy has gotten to be... but without guns and cars) and an artifact collector. I need mini missions to get them to the main story line. I am open to any ideas that either involve those scenarios or I can fit it in possibly in some other town.