This is an addon that was developed for the game. It is a birthday reminder, so the player will be reminded about the birthdays of the NPCs in the game. The message will be sent from the mayor. Each message has additional text for the specific villager.

It works for all of the NPCs in the game, even the ones that are only found in one village.

It is a good idea to install the latest version of the game and the addon, as they are the most current and have the most updated version of the API.