Deleting an event that has been made without a time

When inputting a scheduled event, I’ve accidentally created events without times. The system automatically assigns the time 12 AM. Once this is done, the user has no way of being able to delete this event and it does not show up on the days it is assigned to. Because of this, it overcrowds the selection of events to submit. Have a clear way to delete accidental mistakes such as this. Also, events should not be scheduled without a time, so to prevent this, flag the boxes to input a time once it tries to be submitted