How do you start recruiting for the slime village? Nobody there says anything about it to me.
When visiting Perpetua's house you can look trough her bookshelf. There you can take a look at Perpetuas secret evil schemes, where she has a sleim vllge restoration section where she has drawn up plans to restore the village. Exhaust all of her dialog and revisit sleim vllge. When you return Perpetua should be with Silver at the Sleim vllge shoppe. Talk to them, and you can begin the Sleim vllge restoration. You may have to exhaust dialog with the shopkeeper as well, before you can begin the restoration.