I love your work and i know i have asked this before.
Can you please add some logic to stop people saving an event where the closing date is before the end date and the end date is before the start date.
Begin: Friday, 28. October 2016 - 00:30
End: Friday, 28. October 2016 - 17:00
Closing date: Monday, 31. October 2016 - 12:00