Specific dates in which special fares or promotions do not apply. Typically exist around holidays or special events.

Dates that are not available to be sold as a result of high demand and limited availability. Blackout Dates often occur over major holidays when consumer travel is at its height or during a hotel' [..]

A day that you are not operating your tours. A moderrn booking software should allow you to quickly and visually update your calendar if necessary. so your visitors can’t book online for the day.

With regard to venues and hotels, dates that are not available to be sold as a result of high demand or limited availability.

A period of time during which an airline will not allow certain types of fares or tickets to be sold or honored, such as during peak or holiday travel times.

refers to a date or series of dates on which travel is NOT available. Can refer to airline, hotel or car rental arrangements.

Refer to 'Overbooking'

Also known as Blackout Periods. These are the dates on which certain fares or certain types of tickets are not permitted. Blackout dates can also extend to issues like baggage or cargo restrictions (f [..]

 Refers to a date or series of dates on which travel is NOT available. Can refer to airline, hotel or car rental arrangements.

   Specific time periods when bookings and reservations are unavailable for flights, hotels, attractions and such. They often occur during high season when demand is high.

certain dates (usually holidays) when special rates/fares are not allowed.