Why not add a feature in which I can rank events according to importance, or flag something as important. Because, say my calendar has 10 events for a day, then this feature can allow me mark an event as ‘Important’ so that I don’t miss it. Maybe allowing rankings would be a bit too far since events are and always should be sorted according to time, but flagging would really be helpful…
I really find my calendar events getting confusing at times, and a flag can help an event stand out prominently in my calendar.