Add function "wake up phone" when alarm.
At present time when it starts ringing due to calendar event it is necessary to turn on the phone, unlock it and then you can see why it ringing. Do something like usual HTC calendar. When it ringing it turns the phone on and show the message so you can react without any additional steps.
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Tudor commented
I would add that the alarm screen would ideally have Dismiss, Edit and a couple of Snooze buttons (for e.g. 5/15/60min). It would also be good to have a Delete button in that screen, so that you can delete an event right from the screen of its reminder, when it pops up (if, for example, that event is only reminding you to do a one-off thing).
I am currently using the app Calendar Snooze to have that functionality but it would be good if Calengoo had it built in.