Today it is possible to register special dates (e.g. holidays) and the message of those dates is customizable, but it is a single and standard message for all. It would be useful to be able to configure a different message for a special date - for example, to leave a registered Merry Christmas message for December 25 and a Happy New Year message for December 31, without having to manually edit the message on the day and return to the default later.

Since there is already a TIME exception for a special date, it would make sense to have a MESSAGE exception also, linked to the same date.