How to make calendar and booking unavailable
In order to make calendar and booking unavailable can use the option that allows to Owner to add iCal feeds to listings and add an iCal from a platform (like Airbnb) that has the option to block all dates in the calendar and mark it as booked.
Help for Ical feed feature: iCalendar Import / Export
Example of how to block dates on Airbnb and export iCal from their platform with all dates booked.