How can you have Gracie visit your town in Animal Crossing: New Leaf?
You have to get the second best store.
After the player has expanded the Nookling store in their town to T.I.Y., Gracie will start to visit the town's Plaza on completely random days. However, Gracie may rarely appear for some Players, making it more difficult to get the T&T Emporium.
In order to get T.I.Y.:
To upgrade to T.I.Y., the player must spend a total of 50,000 Bells in Super T&T and 21 days have passed since the opening of the store.
You have to upgrade Super T&T into TIY. To do this, at least 50,000 Bells have to be spent at the store and TIY has to be in the town for at least 21 days. Also Gracie visits the town plaza on random days.