If a campaign has zero availability - let us know on the IM widget (bottom right of screen) and we can check that everything is pulling through accurately.
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If you are hoping for a certain date, but it has an X this is because that date is not available.

Availability is affected by:

1) The availability of the agencies

2) The required lead time set by agencies
3) The number of assets available and their availability on a given date

These factors may mean that you are unable to select your preferred dates. 

You will see the dates which are unavailable on the calendar as they will be blocked out: