Hakema.io already allows you to add a break or holidays anytime See here. 


You can also choose to close your booking calendar to your customers for Public Holidays (for e.g. New year) with a click of a single button. It is really simple to activate this feature.


Go to Admin > Settings > Booking > Public Holidays 



When you click on “Open” it will bring this popup.



Once “Confirmed” your customers will not be able to make bookings on public holidays but you can still add bookings from Admin.


 


You will also notice Public Holidays marked under the date on your calendar.