Calendar for Lockscreen is a new jailbreak tweak that displays your upcoming calender events on your Lock screen. Unlike notifications, the events will not disappear after you unlock your device, and they will only be removed after they have expired.
The tweak even allows you to customize how your events will be displayed. You can go do this by navigating to Settings > Calendar for Lockscreen. From here you can choose how many events to display, how many days in advance they should display, color / size of text and so on. Calendar for Lockscreen also features the ability to swipe right on an event to open your Calendar app.