I want to start a Princess Cadence fan club kind of thread.

[Silver Star 60]

Where can I start this fan club kind of thread?

[Mywas 687]

In the sugar cube corner

[An Old Head 4,816]

Fan clubs for any pony or character in the show generally go in Sugarcube Corner, which is for miscellaneous pony discussion.

It just so happens that one already exists for Princess Cadance over there - it can be found here. By all means post to it!