Including calendars in a publication dates the material, because the publication may not be useful after the calendar date has passed.
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Question

Including calendars in a publication dates the material, because the publication may not be useful after the calendar date has passed. 
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Quizplus · Accepted Answer

Including calendars in a publication can date the material, making it less relevant or useful once the dates have passed, as it ties the content specifically to the time frame of the calendar.

Including Calendars in a Publication Dates the Material, Because the Publication