Since this game is more medieval centric, than a futuristic setting, such as in FF VII, I think a carnival would suit this game's world best. Have a carnival placed somewhere in the games world (Somewhere in Coerthas or La Noscea, maybe) and offer players to enter (similar to a settlement) and be able to interact with NPC characters and mini-game varieties for players to spend time in and earn points to unlock cool items and such.

I think this would:

A) Accomplish giving the players more things to do in their spare time, which allows them to play mini game solo or with friends and earn goodies

B) Gives more flavor and personality to the world around the players

I think this was actually a really positive, inspiring thread made by the original poster, and I think the devs should take it under consideration for the future when they have nothing on their plates keeping them busy. Good ideas I see here!