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Hello.
You can make the blank booking for such date(s) at the Booking > Add booking page, to set such date(s) as unavailable.
In the Booking Calendar Business Small or higher versions you can use “Auto fill” button at the top toolbar in the Booking > Add booking page to make the fast blank booking in 3 mouse clicks.
If you need to set different available dates for the different seasons, then it’s possible in the Booking Calendar Business Medium or higher versions.
Check more about this feature here:
Watch it in this video guide