The app should maximize it's visual capabilities in regards to information that should be intuitively presented. For example, crossing out days that have passed in the agenda like completed tasks would provide quick information that the event/day has passed through a visual cue of a line across the words. This allows you to easily focus on your current event without scanning. A calender should intuitively simplify one's life.
Task categorization would also be a great improvement. Categories such as, "urgent", "defer", "overdue", etc., with visual cues allows for even more organization and better efficiency, less sorting of task priority, and a less stressful time managing what life throws at you.