As a business owner it would be ideal if the widget showed the message to customers if the venue is close OR to show how long can customers book up until for same day service/ contact restaurant directly.

or just when its full would save a lot of phone calls ? 

100% agree - if on annual leave to let customers know, save a lot of phone calls

Or have different 'close-outs' that can be set to show different messages on the website.

Restaurant is fully booked, please contact the restaurant directly (if you might be able to take a reset, outside only tables etc)

or

Restaurant is fully booked.

or

Restaurant is closed.

Is there a way to do this? Does anyone know?