Pop-up note appears based on date specific search

I would love the ability to have notes pop up in the booking screen based on the date range selected to explain why nothing is available or make people aware of special circumstances. Seems like this could maybe be tied to Events to display the name of that event.

E.g. someone tries to book a boat rental in January and the message "Closed for 2014 season" or "2015 season begins May01" appears rather than the generic "unavailable" message. Another example would be "Closed for [insert special event details here]" if it seems like we should have availability but don't.
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