Do you want to stop online bookings for just a one-off period? Here's how to do it:
1) Create a Periodic Close out
Go to Settings - Close Outs - Add New Period
Name - add the close out's name for your reference
Internal Description - only you and your staff can see this
Message to Customers - this doesn't display as of yet, so you can ignore this
Mode - Periodic
Type - Common
Colour - pick your favourite
Add Time Interval - make sure this covers from your opening to closing times
Area - All
Click Add and you're done
2) Exception Date
Go to Settings - Online Settings (Under Diary Configuration) - Other Details - Booking
Under Online Settings, you'll find the Except Dates section
Add in your dates
Click Create Exception
Remember to Save at the bottom of the page!
You can also remove exceptions by pressing the x next to the date