This app would replace calendar event notifications, providing snooze functionality and notifications persistence. Do not expect anything above that.
Questions on how to use the app? See FAQ at https://github.com/quarck/CalendarNotification/wiki
1.3.20: German translation update, thanks to MaDill
1.3.18 Time precision improvements for Android M and N
This build is using the alarm clock API for reminders, making reminders way more precise on time but as a side effect - there will be alarm clock icon in the status bar when there are snoozed events / active reminders
You could disable this new functionality under Settings -> Behavior -> Use setAlarmClock for reminders