Events notification from Calendar

Hello,
when we receive reminder about event from calendar, we hear some sounds, that's good. But we we unlock the phone, we need to search for it. I mean, when that reminder is going, there is no change of icon or some special notify in upper bar (and I think there should be). Then we swipe down near clock we see, but all events from that day all the time, no change (I think that the exact event (that the one who rang) should be marked somehow).