Twinkle is a free app that lets you set and keep track of upcoming and past events. The app will tell you how far away an event is, and allow you to add it to your BlackBerry calendar. Through your calendar, you can always get notifications of upcoming events by setting alerts, but Twinkle gives you a more visual way of seeing the events that are coming up.
Recently, Twinkle was updated to version 2.0, and added the ability to import events into Twinkle from the Calendar, integrate with Universal Search, and navigate through the application with keyboard shortcuts.
Read more about the update from this link and grab the app from App World.