If you don't want to put all your available rooms for sale on the internet immediately, but add it from time to time or have an allotment agreement with a portal, you need to check the days when the availability is over or has decreased below a specific limit.
☞ Docs: Allotment
This plugin allows you to set a limit to check availability, and at the same time to receive an email (daily or every 3, 7, 14, 28 days), with a report containing a calendar for each room. The calendar shows the days when the room's availability has reached or fallen below the set limit.
You can also define the report's time frame by indicating how many months the report's calendar should be extended.