Don't know what to do at night for "shady business" (btw, misspelled in game) or for the trouble maker fairy.
For Shady Business you need to have the form from the sewers and explore the town at night. If you are playing the newest version tehre should be an NPC at night in the central area who also gives you a hint where to find the person you are looking for.
Trouble Maker Fairy requires yet another form that helps you to reach new heights to find some new spots in town.
That form can be found when expploring the western plain if you heavent aquired it yet.
Hope that helps!