iOS settings app -> Notifications-> Calendar -> Sounds Here you can choose a longer and more annoying sound. Same with vibrations (and you can create a custom

iOS settings app -> Notifications-> Calendar -> Sounds Here you can choose a longer and more annoying sound. Same with vibrations (and you can create a custom one). There is no repeating unfortunately (or fortunately). Make sure the notification Banner Style on and set to persistent so it doesn’t auto-hide.